Timed Mini Boss, other fixes

This build does some behind the scenes streamlining of the job process (cleaned up some code). This was in service to trying to fix some strange issues I've encountered with the "Kill the Mini Boss" job.

The two real public facing changes of this are:

1. This job is now timed. You have 60 seconds, which may pose a real challenge.

2. The objective arrow will now point to the mini boss, so at least they are easier to find

I also put up some new art in the second level, since after moving the manager kiosk there was a bit too much empty space on that wall.

One more bonus... the revolver now allows you to hold up to 12 bullets. Let's just pretend you have a speed loader. The real reason for this change... well you won't see that until level 8 of the full version.