Remove custom font injection (#656)

# Why
We load custom font from a file, and it generates the *.import files any
time new

# What
Fallback to the original editor provided fonts

addons/gdUnit4/src/ui/GdUnitFonts.gd

@@ -1,28 +1,31 @@
+@tool
 class_name GdUnitFonts
 extends RefCounted
 
-const FONT_MONO = "res://addons/gdUnit4/src/update/assets/fonts/static/RobotoMono-Regular.ttf"
-const FONT_MONO_BOLT = "res://addons/gdUnit4/src/update/assets/fonts/static/RobotoMono-Bold.ttf"
-const FONT_MONO_BOLT_ITALIC = "res://addons/gdUnit4/src/update/assets/fonts/static/RobotoMono-BoldItalic.ttf"
-const FONT_MONO_ITALIC = "res://addons/gdUnit4/src/update/assets/fonts/static/RobotoMono-Italic.ttf"
-
 
 static func init_fonts(item: CanvasItem) -> float:
-	# add a default fallback font
-	item.set("theme_override_fonts/font", load_and_resize_font(FONT_MONO, 16))
-	item.set("theme_override_fonts/normal_font", load_and_resize_font(FONT_MONO, 16))
+	# set default size
 	item.set("theme_override_font_sizes/font_size", 16)
+
 	if Engine.is_editor_hint():
+		var base_control := EditorInterface.get_base_control()
+		# source modules/mono/editor/GodotTools/GodotTools/Build/BuildOutputView.cs
+		# https://github.com/godotengine/godot/blob/9ee1873ae1e09c217ac24a5800007f63cb895615/editor/editor_log.cpp#L65
+		var output_source_mono := base_control.get_theme_font("output_source_mono", "EditorFonts")
+		var output_source_bold_italic := base_control.get_theme_font("output_source_bold_italic", "EditorFonts")
+		var output_source_italic := base_control.get_theme_font("output_source_italic", "EditorFonts")
+		var output_source_bold := base_control.get_theme_font("output_source_bold", "EditorFonts")
+		var output_source := base_control.get_theme_font("output_source", "EditorFonts")
 		var settings := EditorInterface.get_editor_settings()
 		var scale_factor := EditorInterface.get_editor_scale()
 		var font_size: float = settings.get_setting("interface/editor/main_font_size")
+
 		font_size *= scale_factor
-		var font_mono := load_and_resize_font(FONT_MONO, font_size)
-		item.set("theme_override_fonts/normal_font", font_mono)
-		item.set("theme_override_fonts/bold_font", load_and_resize_font(FONT_MONO_BOLT, font_size))
-		item.set("theme_override_fonts/italics_font", load_and_resize_font(FONT_MONO_ITALIC, font_size))
-		item.set("theme_override_fonts/bold_italics_font", load_and_resize_font(FONT_MONO_BOLT_ITALIC, font_size))
-		item.set("theme_override_fonts/mono_font", font_mono)
+		item.set("theme_override_fonts/normal_font", output_source)
+		item.set("theme_override_fonts/bold_font", output_source_bold)
+		item.set("theme_override_fonts/italics_font", output_source_italic)
+		item.set("theme_override_fonts/bold_italics_font", output_source_bold_italic)
+		item.set("theme_override_fonts/mono_font", output_source_mono)
 		item.set("theme_override_font_sizes/font_size", font_size)
 		item.set("theme_override_font_sizes/normal_font_size", font_size)
 		item.set("theme_override_font_sizes/bold_font_size", font_size)
@@ -31,13 +34,3 @@ static func init_fonts(item: CanvasItem) -> float:
 		item.set("theme_override_font_sizes/mono_font_size", font_size)
 		return font_size
 	return 16.0
-
-
-static func load_and_resize_font(font_resource: String, size: float) -> FontFile:
-	var font: FontFile = ResourceLoader.load(font_resource, "FontFile")
-	if font == null:
-		push_error("Can't load font '%s'" % font_resource)
-		return null
-	var resized_font: FontFile = font.duplicate()
-	resized_font.fixed_size = int(size)
-	return resized_font