Implement support for [codeblock] tag in help

It allows to define a multiline space-indented code block that will be properly parsed by the reST converter for the online docs.
The in-editor help understand the [codeblock] tag as it supposedly understand [code] already (i.e. it just seems to discard it, though the code was supposed to switch it to a monospace font, but that's likely another issue.

doc/base/classes.xml

@@ -9606,13 +9606,12 @@ This approximation makes straight segments between each point, then subdivides t
 </class>
 <class name="Directory" inherits="Reference" category="Core">
 	<brief_description>
-	Directory type.
+	Type used to handle the filesystem.
 	</brief_description>
 	<description>
 	Directory type. Is used to manage directories and their content (not restricted to the project folder).
-
-How to iterate through the files of a directory example:
-
+	Example for how to iterate through the files of a directory:
+	[codeblock]
 	func dir(path):
 	    var d = Directory.new()
 	    if d.open( path )==0:
@@ -9620,12 +9619,13 @@ func dir(path):
 	        var file_name = d.get_next()
 	        while(file_name!=""):
 	            if d.current_is_dir():
-				print("Is directory: " + file_name)
+	                print("Found directory: " + file_name)
 	            else:
-				print("Is File:" + file_name)
+	                print("Found file:" + file_name)
 	            file_name = d.get_next()
 	    else:
 	        print("Some open Error, maybe directory not found?")
+	[/codeblock]
 	</description>
 	<methods>
 		<method name="open">
@@ -12950,7 +12950,6 @@ Returns an empty String "" at the end of the list.
 			<description>
 			Connect to a host. This needs to be done before any requests are sent.
 			The host should not have http:// prepended but will strip the protocol identifier if provided.
-
 			verify_host will check the SSL identity of the host if set to true.
 			</description>
 		</method>
@@ -12974,11 +12973,13 @@ verify_host will check the SSL identity of the host if set to true.
 			<description>
 			Sends a request to the connected host. The url is what is normally behind the hostname, i.e. in [code]http://somehost.com/index.php[/code], url would be "index.php".
 			Headers are HTTP request headers.
-			To create a POST request with query strings to push to the server, do::
+			To create a POST request with query strings to push to the server, do:
+			[codeblock]
 			var fields = {"username" : "user", "password" : "pass"}
 			var queryString = httpClient.query_string_from_dict(fields)
 			var headers = ["Content-Type: application/x-www-form-urlencoded", "Content-Length: " + str(queryString.length())]
 			var result = httpClient.request(httpClient.METHOD_POST, "index.php", headers, queryString)
+			[/codeblock]
 			</description>
 		</method>
 		<method name="send_body_text">
@@ -13086,10 +13087,12 @@ verify_host will check the SSL identity of the host if set to true.
 			<argument index="0" name="fields" type="Dictionary">
 			</argument>
 			<description>
-			Generates a GET/POST application/x-www-form-urlencoded style query string from a provided dictionary, e.g.::
+			Generates a GET/POST application/x-www-form-urlencoded style query string from a provided dictionary, e.g.:
+			[codeblock]
 			var fields = {"username": "user", "password": "pass"}
 			String queryString = httpClient.query_string_from_dict(fields)
 			returns:= "username=user&amp;password=pass"
+			[/codeblock]
 			</description>
 		</method>
 	</methods>

doc/tools/makerst.py

@@ -100,7 +100,7 @@ def make_class_list(class_list, columns):
 
 def rstize_text(text,cclass):
 
-	# Linebreak + tabs in the XML should become two line breaks
+	# Linebreak + tabs in the XML should become two line breaks unless in a "codeblock"
 	pos = 0
 	while True:
 		pos = text.find('\n', pos)
@@ -112,6 +112,38 @@ def rstize_text(text,cclass):
 			pos += 1
 		post_text = text[pos+1:]
 
+		# Handle codeblocks
+		if post_text.startswith("[codeblock]"):
+			end_pos = post_text.find("[/codeblock]")
+			if end_pos == -1:
+				sys.exit("ERROR! [codeblock] without a closing tag!")
+
+			code_text = post_text[len("[codeblock]"):end_pos]
+			post_text = post_text[end_pos:]
+
+			# Remove extraneous tabs
+			code_pos = 0
+			while True:
+				code_pos = code_text.find('\n', code_pos)
+				if code_pos == -1:
+					break
+
+				to_skip = 0
+				while code_pos+to_skip+1 < len(code_text) and code_text[code_pos+to_skip+1] == '\t':
+					to_skip += 1
+
+				if len(code_text[code_pos+to_skip+1:])==0:
+					code_text = code_text[:code_pos] + "\n"
+					code_pos += 1
+				else:
+					code_text = code_text[:code_pos] + "\n    " + code_text[code_pos+to_skip+1:]
+					code_pos += 5 - to_skip
+
+			text = pre_text + "\n[codeblock]" + code_text + post_text
+			pos += len("\n[codeblock]" + code_text)
+
+		# Handle normal text
+		else:
 			text = pre_text + "\n\n" + post_text
 			pos += 2
 
@@ -179,6 +211,13 @@ def rstize_text(text,cclass):
 				tag_text = ''
 			elif cmd == '/center':
 				tag_text = ''
+			elif cmd == 'codeblock':
+				tag_text = '\n::\n'
+			elif cmd == '/codeblock':
+				tag_text = ''
+				# Strip newline if the tag was alone on one
+				if pre_text[-1] == '\n':
+					pre_text = pre_text[:-1]
 			elif cmd == 'br':
 				# Make a new paragraph instead of a linebreak, rst is not so linebreak friendly
 				tag_text = '\n\n'

tools/editor/editor_help.cpp

@@ -1201,7 +1201,7 @@ void EditorHelp::_add_text(const String& p_bbcode) {
 			class_desc->push_font(get_font("italic","Fonts"));
 			pos=brk_end+1;
 			tag_stack.push_front(tag);
-		} else if (tag=="code") {
+		} else if (tag=="code" || tag=="codeblock") {
 
 			//use monospace font
 			class_desc->push_font(get_font("source","EditorFonts"));