Removed `program` state flag property and replaced with operation distinguishing from selection menu;
Branched numeral and character option logic in main();
Fixed test mode toggle;
Minor menu edits;
Removed the status of variables `program`, `p_name` and `p_path` as storage to simplify code;
Verified that double escapes were and are not required by the user to launch programs by path;
Standardized error messages, included `KeyboardInterrupt` exceptions, and added umbrella error catchers.
