Convert DOS line endings to Unix line endings

Should fix issues some of us have with `misc/dist/uwp_template/AppxManifest.xml`
always showing up as modified.
Might cause issues on Windows due to the removal of BOMs or change of line endings
in some of the Mono, UWP or gradlew.bat files, we will test and adapt if need be.

misc/dist/uwp_template/AppxManifest.xml

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Package xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10" xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest" xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10" IgnorableNamespaces="uap mp build" xmlns:build="http://schemas.microsoft.com/developer/appx/2015/build">
   <Identity Name="$identity_name$" Publisher="$publisher$" Version="$version_string$" ProcessorArchitecture="$architecture$" />
   <mp:PhoneIdentity PhoneProductId="$product_guid$" PhonePublisherId="$publisher_guid$" />

modules/mono/editor/GodotSharpTools/GodotSharpTools.sln

@@ -1,4 +1,4 @@
-
+
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 2012
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "GodotSharpTools", "GodotSharpTools.csproj", "{A8CDAD94-C6D4-4B19-A7E7-76C53CC92984}"

modules/mono/glue/cs_files/ExportAttribute.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 
 namespace Godot
 {

modules/mono/glue/cs_files/MarshalUtils.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 
 namespace Godot

modules/mono/glue/cs_files/ToolAttribute.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 
 namespace Godot
 {