Add support for more motor controller break configurations

[noahzemlin]

Currently, the Motor class will write 255 to enpin when speed == 0 as most motor controllers will treat in1pin = in2pin as break or coast regardless of enpin. Some motor controllers, however, determine break vs coast based on the value of enpin.

Example Datasheet with such configuration: https://www.teachmemicro.com/download/l298n-datasheet/?wpdmdl=3366&refresh=5e3f81b45b3cc1581220276 (see page 6)

RobotLib/src/Motor.cpp

Line 141 in 98b9915

analogWrite(this->enpin, 255);

RobotLib/src/Motor.cpp

Line 177 in 98b9915

analogWrite(this->enpin, 0);

RobotLib/src/Motor.cpp

Line 191 in 98b9915

analogWrite(this->enpin, 0);

will need to be changed to have configurable values instead of 255 or 0.