Adjust Engine for new Deps repository

Deps were moved to new repository:
    http://github.com/nfprojects/nfenginedeps

This commit removes old nfEngine Deps projects from Engine.sln, since Deps
now have its own separate repository and Solution file. Additionally, all
Engine projects are adjusted for new nfEngineDeps structure.

Verification:
    * Use git submodules to download nfEngineDeps
    * Batch build nfEngineDeps
    * Batch build Engine
    * Run tests, check if nfEngineTest works

Change-Id: Ib2ae369fd538f3e9db3a1f9d8713f540c4a1e69b