Add a feature to switch to an easy PRNG with set-able seed for trace log generation.

[FormerlyZeroCool]

Feature will be used for comparing trace logs to live machine state being debugged.

[gulrak]

Adding a few new command-line options:

• --random-gen <engine> that can override the original random generator with rand-lcg selecting a classical LCG (state = ((state * 1103515245) + 12345) & 0x7FFFFFFF; return (uint8_t)(state>>16);) and counting a generator that simply returns the state and increments it
• --random-seed that set the initial state for the two generators, defaulting to 12345
• --screen-dump that reenables the now by default disabled (but repaired) screen dump at the end of a trace run
  Also the auto-stop feature works in the trace run now, if a self-jump is detected and the selected CHIP-8 variant is written before the trace run to document the behavior the trace was run with.

[gulrak]

Released in v1.1.8