Fixes for cppcheck 2.18

A series if cppcheck fixes that are found by cppcheck 2.18:

• replace C-style casts
• fix uninitialized members
• StreamBuffer/RootAddress: forbid copy/assignment
• EvtStoreSvc: fix bug in addPreLoadItem due to re-using begin() iterator twice in find
• replace substr with resize
• a few other minor fixes