Dragging! & basic proportional box resize frm cursor distance to box pos

Still need to add resize via 'pulling' to stretch the box out from a side or 2 sides diagonally.

Also some general clenaup of code

code/grime.odin

@@ -80,6 +80,10 @@ OS_Type :: type_of(ODIN_OS)
 // Proc Name Overloads Alias table
 // This has to be done on a per-module basis.
 
+add :: proc {
+	add_range2,
+}
+
 cm_to_pixels :: proc {
 	f32_cm_to_pixels,
 	vec2_cm_to_pixels,