Reverted implementation of redstone linker
Dropped vanilla linkers - gonna use mod pipes and like only.
Moving to multi-module build, with APIs in separate sub-modules'
Other mod APIs are now compiled from sources as separate submodules. Added APIs for NEI, AppEng, CoFHLib
1. Build script: root project uses default location
2. Cleaned all remaining traces of RedstoneLinker
3. Re-added FluidLinker
Added onNeighborChange traversal