Arduino custom type boolean is now mapped to bool type

Fixes #2151
Fixes #2147

Author: cmaglie

hardware/arduino/avr/cores/arduino/Arduino.h

@@ -114,7 +114,7 @@ typedef unsigned int word;
 
 #define bit(b) (1UL << (b))
 
-typedef uint8_t boolean;
+typedef bool boolean;
 typedef uint8_t byte;
 
 void init(void);

hardware/arduino/sam/cores/arduino/wiring_constants.h

@@ -92,11 +92,9 @@ typedef unsigned int word;
 
 #define bit(b) (1UL << (b))
 
-// TODO: to be checked
-typedef uint8_t boolean ;
+typedef bool boolean ;
 typedef uint8_t byte ;
 
-
 #ifdef __cplusplus
 } // extern "C"
 #endif // __cplusplus