commands.c: Misc formatting fixes
src/commands.c: Heavily simplify

- Refactored isVersion() and isHelp() into single return statements with
terniary operator, and factored out intermediary variables.
- Changed both of the mentioned function's return types to bool.
- Shortened printVersion() text.
- Simplified laco_handleFlag
Move remnants of commands.c into main.c
Remove LACO_TIMESTAMP