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

@@ -55,7 +55,7 @@ static const kaleidoscope::Leader::dictionary_t leader_dictionary PROGMEM =
 void setup() {
   Serial.begin(9600);
 
-  USE_PLUGINS(&Leader);
+  Kaleidoscope.use(&Leader);
 
   Kaleidoscope.setup();
 

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) {