Updated PWM test application (testapp1/pwm.cpp)
Implemented GPIO test application (testapp1/gpio.cpp)
Added additional HAL_Servo_XXX() methods for testing Servo library
Updated HAL servo template
Implemented SERVO test application (testapp1/servo.cpp)
Added additional HAL_Tone_XXX() methods for testing Tone library
Updated HAL tone template
Implemented TONE test application (testapp1/tone.cpp)