[client] overlay: move keybinds and config into the overlays

This adds a new `earlyInit` call which allows the overlay to register
options before actually being intialized. Also the keybind handling and
state tracking for each overlay has been moved internal to the overlay
itself.

client/src/overlay/fps.c

@@ -22,10 +22,39 @@
 #include "cimgui.h"
 #include "overlay_utils.h"
 
+#include "common/option.h"
+
 #include "../main.h"
 
-static bool fps_init(void ** udata, void * params)
+static bool showFPS;
+
+static void showFPSKeybind(int sc, void * opaque)
 {
+  showFPS ^= true;
+  app_invalidateWindow();
+}
+
+static void fps_earlyInit(void)
+{
+  static struct Option options[] =
+  {
+    {
+      .module         = "win",
+      .name           = "showFPS",
+      .description    = "Enable the FPS & UPS display",
+      .shortopt       = 'k',
+      .type           = OPTION_TYPE_BOOL,
+      .value.x_bool   = false,
+    },
+    { 0 }
+  };
+  option_register(options);
+}
+
+static bool fps_init(void ** udata, const void * params)
+{
+  app_registerKeybind(KEY_D, showFPSKeybind, NULL, "FPS display toggle");
+  showFPS = option_get_bool("win", "showFPS");
   return true;
 }
 
@@ -36,7 +65,7 @@ static void fps_free(void * udata)
 static int fps_render(void * udata, bool interactive, struct Rect * windowRects,
     int maxRects)
 {
-  if (!g_state.showFPS)
+  if (!showFPS)
     return 0;
 
   ImVec2 pos = {0.0f, 0.0f};
@@ -68,6 +97,7 @@ static int fps_render(void * udata, bool interactive, struct Rect * windowRects,
 struct LG_OverlayOps LGOverlayFPS =
 {
   .name           = "FPS",
+  .earlyInit      = fps_earlyInit,
   .init           = fps_init,
   .free           = fps_free,
   .render         = fps_render