Fixed issues relating to saplings and leaves

- Removed cBlockInfo::RequiresSpecialTool
* Fixes #1195
* Fixes #1201
wait, as far as i know, the first 0-3 metas are for display information then 4-7 are the one that don't decay because they are placed by hand and 8-11 are the one that are generated and can decay and 12-15 aren't uesed...