sl/fixed_point: use blue color for static CFG
sl/symutil: unimplement traverseLivePtrs()

The assumption that addresses can be stored on pointer fields only is wrong.
sl/symheap: unimplement SymHeapCore::gatherLivePointers()

The assumption that addresses can be stored on pointer fields only is wrong.
sl/symheap: substitute objData -> fldData where appropriate
sl/symheap: merge BK_DATA_PTR + BK_DATA_OBJ -> BK_FIELD