Added `setTimeout()` function to set the time limit in sketch

examples/Qukeys/Qukeys.ino

@@ -33,6 +33,7 @@ void setup() {
     kaleidoscope::Qukey(0, 2, 3, Key_LeftControl),  // D/ctrl
     kaleidoscope::Qukey(0, 2, 4, Key_LeftShift)     // F/shift
 	 )
+  Qukeys.setTimeout(200);
 
   Kaleidoscope.setup();
 }

src/Kaleidoscope/Qukeys.h

@@ -80,6 +80,9 @@ class Qukeys : public KaleidoscopePlugin {
   static void deactivate(void) {
     active_ = false;
   }
+  static void setTimeout(uint16_t time_limit) {
+    time_limit_ = time_limit;
+  }
 
   static int8_t lookupQukey(uint8_t key_addr);
   static void enqueue(uint8_t key_addr);