Documentation for HTTPClient.
Added a query_string_from_dict method to HTTPClient to create a x-www-form-urlencoded valid query string for GET and POST messages.
String now has http_escape() and http_unescape() methods to help facilitate the above query_string_from_dict method.
A general speedup should be apparent, with even more peformance increase when compiling optimized.
WARNING: Tested and it seems to work, but if something breaks, please report.
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-Fixed normalmap depth parameter
-Fixes to DirAccess on Windows
-Double click on resource dock will open them
-Fixes to doc generator (should make github wiki on class list more up to date)
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-Documentation now shows overridable theme values (though this needs to be documented).
-Detect when object transform is flipped and flip normals too.
-TileMap can specify bounce and friction for collision.
-Removed limit of 4 lights per object
-Added is_hovered() to buttons.
-load() was in the GDScript docs but missing in the scripting-different music for platformer 2D and 3D
-fix how documentation is generated, built in doc browser should be always up to date
-copypaste, scrolling, etc in builtin doc
-built-in scripts get saved now (though debugger may not always work on them)
-Theme can be set to controls as a property
