Add error messages String::hex_to_int functions, and accept capital X in prefix
Add error messages String::hex_to_int functions, and accept capital X in prefix

Co-authored-by: Rémi Verschelde <4a7fb8776e4352f674590468e6fa4ef4f32789c1@gmail.com>

ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot