Added incomplete LEDButton code generator extensions.

...aspberry/code-gen-hal/inc/brick/bricklet_rgb_led_button.h

org.fortiss.af3.platform.raspberry/plugin.xml

...af3/platform/raspberry/generator/extension/brick/.ratings

...extension/brick/LEDButtonBActuatorGeneratorExtension.java

...extension/brick/LEDButtonGActuatorGeneratorExtension.java

...extension/brick/LEDButtonRActuatorGeneratorExtension.java

...af3/platform/raspberry/generator/transform/brick/.ratings

...tor/transform/brick/LEDButtonBActuatorTransformation.java

...tor/transform/brick/LEDButtonGActuatorTransformation.java

...tor/transform/brick/LEDButtonRActuatorTransformation.java