Cont/kb/mouse focus priorities and behaviors reworked (#15)

* ensure focus after cont/kb input + enable mouse on SDL_QUIT + force focus to prompt while open

* only force prompt focus if mouse is not active

* default kb input, mouse click switches to kb focused input

include/recomp_ui.h

@@ -116,6 +116,8 @@ namespace recomp {
 	PromptContext *get_prompt_context(void);
 
 	bool get_cont_active(void);
+	void set_cont_active(bool active);
+	void activate_mouse();
 }
 
 #endif