The HRTIM still lacks some functions needed for a fine management of the PWM...

The HRTIM still lacks some functions needed for a fine management of the PWM generation. This PR adds several functions. 

Deadtime management
The deadtime can now be managed separately from the rising and falling edges.

Phase shifting
The phase of the second leg can now be updated dynamicall

Bug fixes: 
Readable Independent mode
The independent mode can now be set as buck or boost instead of true or false, making it more readable.

Extra features: 
There is now a board version support for the SPIN board