Add ability to use custom script templates.

[27thLiz]

Templates will be loaded from .godot/script_templates
For now they're disabled for GDNative.

Ideas for further improvements:

• Supply a bunch of default templates.
• Add a "Save as Template" option to the script editor, as it can normally only save to res://
• Support more placeholders / custom placeholders

Fixes #4132

[bojidar-bg]

@Hinsbart (looking at the screenshot) Shouldn't template names be capitalized? E.g. "no_comments" -> "No Comments".

[27thLiz]

@bojidar-bg ah yeah, sounds good

[voOID12]

This would be nice for C# also! 😄

[bojidar-bg]

@voOID12 It is already possible with the followup #12536. Probably you missed it when searching as it mentions "mono" and not "C#" 😃

[voOID12]

@bojidar-bg Yes! just got it to work! Thanks! 😄

Created a minimalistic template with it, found the %CLASS% tag in the source code. God I love open source 😋

using Godot;

public class %CLASS% : %BASE%
{
%TS%
}

[voOID12]

Also just to point out, under Windows, the path to the custom templates are there:

%appdata%/Godot/script_templates

[JRiggles]

For anyone else coming here from a search engine

• Windows: %APPDATA%\Godot\script_templates\
• Linux: $HOME/.config/godot/script_templates/
• macOS: $HOME/Library/Application Support/Godot/script_templates/