move Block constants from block to globals.h, prep. for constexpr removal
move constant from server to global
move player.h constexpr to globals.h
move constexpr from world to globals
chatdialog constexpr -> globals.h

(even thoguh this file isn't even compiled)
partial constexpr -> #define support

fuck msvc. pile of shit compiler probably won't see full constexpr support
until 2015 (partial is supposed to come in 2014). What a worthless pile
of shit compiler. thanks microsoft.
constexpr should be fully removed
woops, forgot one constexpr..