added :next, a command for declaring a label halfway through instructions.
added documentation and an example for :next
ensured that the last frame of a program will be rendered after a halt
initial implementation of a basic breakpoint debugger.
Updated the readme to describe the prototype debugger.
modified register dump to show any register aliases.
fleshed out some basic label inference based on the compiler's symbol table and added an inferred stack trace to the register display.
if i set to interpreter space it's a fair guess that it's using the hex font sprite data.
minor usability tweaks. The i key is now an interrupt mode toggle and the o key provides single-step functionality.
fixed incorrect address calculation for references to entrypoint at beginning of a rom.