6.0 Changes

- Removed Profession perks.
- All 91-99 leveling perks should have a level check. These will get
baselined sometime after 6.0 launches.
- Removed some deprecated and dead code.
- Removed outdated comments.
- Some rogue global variables were changed to hardcoded values to
improve performance.
- Commented out some dead code.
- Reorganized the damage calculation method.
- Condensed constants where applicable, and removed some redundant
method calls.
- static_proc_stats now includes agi_multiplier where applicable.
- determine_stats code is now cleaner with regards to recalculating
crit.
- Lemon Zest calculates the appropriate amount of energy generation for
any number of units.
- Combat energy pooling now factors in bonus energy (set to 20 below
max).
- Cleaned out outdated proc data, proc object, and stats object code.