included more shared textures

included new textures for future SRS mods

included shared textures to be used by the Gravemind Survivor models in the future

Included shared materials from Halo 5's attachments and sights for mods like the BR85N and Reflex MA5D

added shared textures for Halo 4 and Halo 5 models

fixed a typo of one of the MA5 shared textures.