Support architectures different from x86

GDB dashboard strives to not use architecture-dependent code, for example, registers shown by default are those considered to be general according to GDB. Unfortunately, for architectures different from x86, the GDB support for that regard is lacking, the best solution as for now is to manually customize the list of registers that are shown by default, for example:

dashboard registers -style list 'r0 r1 r2 r3 r4 r5 r6 r7 r8 r9 r10 r11 r12 sp lr pc cpsr'

As usual this can also be part of a project of a profile configuration.