Revert "tests: disable custom exception check until implementation"

This reverts commit 25eefee2f72774bef49fbdab052dd40f060faeac.

Exceptions are present now in my fork...
Pass config handler to projectlist factory
prepare version 0.2.7.4

update README
Move projectroot config read out of project list classes

based on commit cb8f6c86c2ff5ea7c33c59374b86d944bd6dad2b

Reduce diff with xiphux and update my ProjectListManifest class

Add GitObjectManager missing requirements and GitConfig change