maximum is always 3; sometimes we know the max size so specify.
bcl has default size = 0, which then resizes to 4 on first addition
wow such optimization
reduce nesting (evo.RequiresLevelUp is checked twice, only check once
and handle path)
compact some methods
seal some classes
add a little xmldoc to exposed members
Too many classes in the same file, break up.
simplify things a little in EncounterArea (remove passing thru nulls,
should throw excpetion immediately if misconfigured).
