Added instruction timing

Basic timing for 2^16 instructions in a tight loop is ~142 useconds / instr
Avoid calling setjmp on every loop()

Instruction time reduced to 132usec/instr
Squeeze another 2 usec reducing in instruction exection
Fix console speed

* cleanups and auto format
Improve CPU speed

With the mmu disabled 115usec/instr
With mmu running 156usec/instr