Stop using deprecated interfaces

Use `Kaleidoscope.use`, `Kaleidoscope.useEventHandlerHook`, and
`Kaleidoscope.useLoopHook` instead of `USE_PLUGINS`, `event_handler_hook_use`,
and `loop_hook_use`, which are getting deprecated.

Signed-off-by: Gergely Nagy <kaleidoscope@gergo.csillger.hu>

README.md

@@ -48,17 +48,17 @@ static void leaderTX() {
   Serial.println("leaderTX");
 }
 
-static const kaleidoscope::Leader::dictionary_t leader_dictionary PROGMEM = 
+static const kaleidoscope::Leader::dictionary_t leader_dictionary PROGMEM =
   LEADER_DICT({LEADER_SEQ(LEAD(0), Key_A), leaderA},
               {LEADER_SEQ(LEAD(0), Key_T, Key_X), leaderTX});
 
 void setup() {
   Serial.begin(9600);
-  
-  USE_PLUGINS(&Leader);
-  
+
+  Kaleidoscope.use(&Leader);
+
   Kaleidoscope.setup();
-  
+
   Leader.dictionary = leader_dictionary;
 }
 ```

examples/Leader/Leader.ino

@@ -51,7 +51,7 @@ LEADER_DICT({LEADER_SEQ(LEAD(0), Key_A), leaderTestA},
 {LEADER_SEQ(LEAD(0), Key_A, Key_A), leaderTestAA});
 
 void setup() {
-  USE_PLUGINS(&Leader);
+  Kaleidoscope.use(&Leader);
 
   Kaleidoscope.setup();
 

src/Kaleidoscope/Leader.cpp

@@ -75,8 +75,8 @@ Leader::Leader(void) {
 }
 
 void Leader::begin(void) {
-  event_handler_hook_use(eventHandlerHook);
-  loop_hook_use(loopHook);
+  Kaleidoscope.useEventHandlerHook(eventHandlerHook);
+  Kaleidoscope.useLoopHook(loopHook);
 }
 
 void Leader::reset(void) {