GlaveSnapshot Layer: Objects are now tracked within a GLV_VK_SNAPSHOT structure.

GlaveSnapshot Layer: Objects are now tracked within a GLV_VK_SNAPSHOT structure.

* Moved the previously static linked lists into a snapshot structure. Old functionality is available temporarily via a defined macro
* Added a description of how the master and delta snapshots are planned to function.
* Added new entrypoints for planned snapshot functionality.
* Started expanding tracking of XGL_DEVICE objects to get a better understanding of what will need to be done for each of the different object types. Some code-gen (or possibly existing scripts) will likely help here.