Patching now works

Patching

Patching should now work, due to fixing a simple bug (using a fully qualified path where a bare filename was used before). Patching should also now work when compiled in debug mode, by changing an ordinary add to a call to wrapping_add, which was the original intent of the C code (bsdiff 4.3) from which the patching routine was oxidized.

Other

Entering blank (those matching the regex ^\s*$) commands should now check for game instances that have exited since the last time a command was issued.