True time-span implementation.

True time-span implementation.

A time-span is a union of continuous interval subsets of the real number
line (0, infinity).  Internally represented by an array of numbers
representing alternately the left and right endpoints of an interval.
Point sets and empty sets are both considered empty.

Pre-allocate tables when creating parse tree nodes in OvaleCompile to be
reused for time-span evaluation within OvaleBestAction.

Convert OvaleBestAction to use time-spans for correctness when dealing
with arbitrary unions and intersections of time intervals when evaluating
nodes.

This fixes ticket 306 - "and" "or" bugged by @Wiljo.

git-svn-id: svn://svn.curseforge.net/wow/ovale/mainline/trunk@1117 d5049fe3-3747-40f7-a4b5-f36d6801af5f