Add support for best hero being leveled beyond 8,000, and the 4.5x multiplier heroes

[dfederm]

Add a checkbox to indicate the best hero is leveled beyond 8k but the next cannot be afforded, which adjusts formulas.

If checked:

• Gold ancients should have a 0.905 multiplier instead of 0.926 (indirectly affects Nog too)
• alpha should use a 1.1085 multiplier instead of 1.4067

[dfederm]

This actually should be changed from 8k+ to the heroes which only have 4.5x multipliers. The multipliers would be slightly different there as well.

Either way though, the current multipliers are at least the correct order of magnitude, so this doesn't seem too high pri. Maybe if someone figured out the correct multipliers first.