add themes and colors :D

src/ui/ui_widgets.h

@@ -78,6 +78,9 @@ void ui_widgets_init();
 // Call each frame before building widgets. Pass in the frame's input.
 void ui_widgets_begin_frame(PlatformInput input);
 
+// Call after changing theme to force text config refresh
+void ui_widgets_theme_changed();
+
 // Reset per-frame text input display buffer allocator (called by begin_frame, but
 // can also be called manually if needed)
 void ui_text_input_reset_display_bufs();