added tested support for PIC16F1455 (and fixed PIC16F1454 support in hidmouse example)

Hi,
I added PIC16F1455 support, which was trivial.  The hid_mouse example works on my PIC16F1455 test platform.
Thanks for m-stack!  I've not used it for anything in production yet, but I'm seriously looking into it.
-=tod