Antialiasing cannot be adjusted on fonts rendered with MSDF.
Internally, Godot always uses grayscale antialiasing for those fonts.
This also tweaks property hints for consistency, and renames
uses of "sub-pixel" to the more commonly used "subpixel".
This pull request is to fix#65633
When trying to add a custom font, my '.ttf' and '.otf' fonts were not visible unless I selected 'All files'. By adding these to the custom property info makes it more convenient to select a different font, without doing the extra clicks to select 'All Files'.
Not a big change, but something I wanted to fix as it seems appropriate to do so.
