Commits on Mar 6, 2021

1. Add C# source generator for a new ScriptPath attribute …

   This source generator adds a newly introduced attribute,
   `ScriptPath` to all classes that:
   
   - Are top-level classes (not inner/nested).
   - Have the `partial` modifier.
   - Inherit `Godot.Object`.
   - The class name matches the file name.
   
   A build error is thrown if the generator finds a class that meets these
   conditions but is not declared `partial`, unless the class is annotated
   with the `DisableGodotGenerators` attribute.
   
   We also generate an `AssemblyHasScripts` assembly attribute which Godot
   uses to get all the script classes in the assembly, eliminating the need
   for Godot to search them. We can also avoid searching in assemblies that
   don't have this attribute. This will be good for performance in the
   future once we support multiple assemblies with Godot script classes.
   
   This is an example of what the generated code looks like:
   
   ```
   using Godot;
   namespace Foo {
   	[ScriptPathAttribute("res://Player.cs")]
   	// Multiple partial declarations are allowed
   	[ScriptPathAttribute("res://Foo/Player.cs")]
   	partial class Player {}
   }
   
   [assembly:AssemblyHasScripts(new System.Type[] { typeof(Foo.Player) })]
   ```
   
   The new attributes replace script metadata which we were generating by
   determining the namespace of script classes with a very simple parser.
   This fixes several issues with the old approach related to parser
   errors and conditional compilation.
   It also makes the task part of the MSBuild project build, rather than
   a separate step executed by the Godot editor.

   

   neikeq committed Mar 6, 2021
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