ESX variable type cleanup
fix for global variables of type short
added variant class
changed global variable records to new variant type
some cleanup and fixing
use new Variant type for GMSTs
fixed gmst integers
change variant in info record to new type
Merge branch 'vartype'
added var type column to globals
Material fixes (vertex colors, alpha)
Avoid manually updating render targets from within frameRenderingQueued
Mipmap fix
Merge branch 'master' of git://github.com/zinnschlag/openmw into graphics
Merge remote-tracking branch 'scrawl/graphics'
Fix transparency sorting
restore loading CELL records in esmtool
Merge remote-tracking branch 'scrawl/graphics'
reworked NIFStream to use a type-handler

Reworked NIFStream to use a type-handler system to decide how to extract
data from the NIF. It also has the capability to perform bulk reads on
compatible platforms, thus improving cell-load performance.
reworked Nif::KeyListT into Nif::CurveT

Renamed Nif:KeyListT to Nif::CurveT, moved it into its own file and
changed its implementation so that on compatible platforms, the entire
array of key-frames can be read in a single read call. Added a helper
class called Nif::CurveT::interpolator to allow other code to easily
evaluate the curve. Reworked part of the skeletonLoader code to use
the interpolator to simplify its own logic.