Refactor include directives to use different paths for arduino/idf.

* Sets macros to allow compiling when Central role is enabled and Observer disabled, or Peripheral enabled and Broadcaster disabled.

* Adds a macro definition for CONFIG_NIMBLE_CPP_IDF to enable different include paths/functionality for IDF / Arduino.

src/NimBLEHIDDevice.h

@@ -15,11 +15,8 @@
 #ifndef _BLEHIDDEVICE_H_
 #define _BLEHIDDEVICE_H_
 
-#include "sdkconfig.h"
-#if defined(CONFIG_BT_ENABLED)
-
 #include "nimconfig.h"
-#if defined(CONFIG_BT_NIMBLE_ROLE_BROADCASTER)
+#if defined(CONFIG_BT_ENABLED) && defined(CONFIG_BT_NIMBLE_ROLE_BROADCASTER)
 
 #include "NimBLECharacteristic.h"
 #include "NimBLEService.h"
@@ -84,6 +81,6 @@ private:
 	NimBLECharacteristic* 	m_protocolModeCharacteristic;	//0x2a4e
 	NimBLECharacteristic*	m_batteryLevelCharacteristic;	//0x2a19
 };
-#endif // CONFIG_BT_NIMBLE_ROLE_BROADCASTER
-#endif // CONFIG_BT_ENABLED
+
+#endif /* CONFIG_BT_ENABLED && CONFIG_BT_NIMBLE_ROLE_BROADCASTER */
 #endif /* _BLEHIDDEVICE_H_ */