Now recognizes & reverses form-changing evolution chains like Sirfetch'd
basically the whole process is to build the tree but point in the
opposite direction (for de-evolution paths)
EvolutionSet was just an object that hides an array, with no logic
was planning to use the EvolutionSet to do the evolution checks, but
EvolutionTree was required to connect the evolution chains together
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).
