Fix grass adding/removing ABM.
Fix liquid_range
* Prevent graphical glitches on old servers
* Fix flowing of liquids with viscosity != 1 and range != 8
* Fix range = 0, no flowing nodes will appear
Fix possible crash with grass ABM.
Portability fixes for OpenBSD (and possibly NetBSD and others).
Add basic protection support to builtin
Fix windows i18n (quite ugly variant for MSVC)