GraphColorManager initial implementation

Close to current coloring scheme.
[log] Extract graph facade building into separate class
[log] Add IntToIntMap, AbstractIntToIntMap, TreeIntToIntMap and TestTreeIntToIntMap
[log] Add GraphFlags
[log] Add PermanentGraph & Layout
[log] Add MutableGraph and simple Impl
[log] Add GraphCellGenerator.
[log] Fix graph, when not all log loaded.
[log] Fix GraphCommitCell when loaded all log.
[log] Copy GraphCellPainter from old log.
[log] Temp fix SimpleGraphCellPainter
[log] Use new GraphFacade
[log] Fix Branch color.
[log] Fix GraphCellGeneratorImpl.