Debugger[New CDB]: Fix stepping issues, forced shutdown, values.
- Do not report start-up trap as stop reason should one trigger while stepping. - Set current frame to first usable frame, avoiding disassembly while stepping - Kill process in case of forced shutdown with pending (long) commands. - SymbolGroupValue: Do a quick check for accessible values and mark failure as 'invalid'. - Introduce flag indicating existence of simple dumpers to types.
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