Added a separate point maximum for polyhedral selections.
BlockType adjustments

- Flagged heads as "cannot be passed through".
- Adjusted shouldPlaceLast (Added anvils, removed heads).
- Fixed portal frame height and added a few new blocks to centralTopLimit
- Made cobblestone wall 1.5 high.
Optimized EditSession.countBlocks.

Also fixed the questionable semantics for that anonymous class' "contains" method.