WIP refactor to support text better Unity upgrade Progress on getting things working Some bug fixes Editor fixes Fix some measurement bugs Implement shrinking Get flex text kind of working Text constraining seems to be working, just need to clean up Clean up measurement code so main and cross axis are separated Fix NRE when deleting flex elements Only determine flex children once per layout Set driven properties in editor on layout Fix children overflowing on cross axis when not using align items stretch Properly distribute grow/shrink when some children hit their min/max size Fix elements not respecting max width when they have children that prefer to be larger than it Support auto sizing x/y axis the root flex element Merge branch 'text-flow'