Added hologram projection offset
Merge branch 'master' of https://github.com/ingie/OpenComputers
Renamed 'offset' to 'translation' to mirror general 3d/ogl terminology.
Added x/z translation for hologram.
Added setting for max translation based on tier.
Made max translation a relative value based on the actual hologram's size (1 = 1x hologram size).
Fixed GUIs being very dark / black sometimes.
Closes #546.