Speeding up platform startup time

Shaved ~1.5seconds off by starting SCL compiler priming at the beginning
of platform startup on the background before the LifeCycleProcesses
project feature needs the compiler.

Also removed seemingly unused VirtualGraphInitializer that installed
virtualgraphs/*.tg files into random memory-persistent virtual graphs
during platform startup. It simply piles on some startup overhead and
does nothing.

gitlab #221

Change-Id: I1ebbc4e292957755cd88f2941cd02730ae8605c8
(cherry picked from commit 6667a65141692bc359087d8f1c9c8561636f1c59)