Removed the md5 library, obsoleted by PolarSSL.

Fixes #1130.
Added PolarSSL dependency to Bindings.
Fixed server forcing players afloat

* Fixes #1131
Fixed bad water/redstone simulator communication

* Fixes #713
Minor change to buttons and levers

+ They now detect if the block they are on occupies its voxel, instead
of just being solid
Added more block exceptions to torches
Changed include folders to work for Bindings, too.
CMake: Added polarssl include dir as non-system.
Fixed a silly path error in #include.
Implemented tripwire(s) (hooks)

* Fixes #944
Fixed issue with breaking blocks at -1 coordinates
Likely fixed too quick food depletion

* Fixes FS427 properly, hopefully
Merge pull request #1132 from mc-server/RemoveMD5

Removed the md5 library, obsoleted by PolarSSL.