twn_input.c: remove input_mouse_captured(), add ctx.mouse_capture

include/twn_context.h

@@ -38,6 +38,7 @@ typedef struct Context {
     /* is set to true when state is invalidated and needs to be rebuilt */
     /* watch for it and handle properly! */
     bool initialization_needed;
+    bool mouse_capture;
 } Context;
 
 /* when included after twn_engine_context there's an 'ctx' defined already */

include/twn_input.h

@@ -15,6 +15,5 @@ TWN_API bool input_action_pressed(const char *name);
 TWN_API bool input_action_just_pressed(const char *name);
 TWN_API bool input_action_just_released(const char *name);
 TWN_API Vec2 input_action_position(const char *name);
-TWN_API void input_mouse_captured(bool enabled);
 
 #endif