SRP recalc, optimizations, finished commenting

Fixed a mistake where payout for a Blops was actually calculated. Changed
to a static of 400m.
Finished code commenting.
Removed old code that is no longer relevant due to removal of decprecated
code.
"About" text is now editable in code instead of through Qt Designer.
Added small database query optimizations.
Removed root LawnMart.sqlite from repo.
Merge branch 'master' of github.com:SnipersCode/LawnMart