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- abstracted RWP code into Cart base class (only F8SC converted for now)
- RWP now works by analysing RAM accesses before and after each instruction, catching all occurrences

Fixes for compiling without debugger support.

The new code introduces a generic 'EmulationWarning' exception that can
be thrown for any reason.  The RWP functionality has been ported to use
this, with the main benefit that if we ever have to add new exceptional
cases, we no longer need to modify M6502 class; it will pick up on the
new exceptions and pass them to the EmulationWorker as necessary.

Functionally, the RWP stuff works the same as before, just with a
different implementation behind the scenes.

- this both speeds up load/save of state files, and makes them smaller
- affects both on-disk files, and Time Machine functionality

- Increase warning level to 4, and fix a few new warnings
- Globally, all files are now explictly compiled in C++ mode
- For png and zlib code (that we didn't write), drop back to level 2
warnings and explicitly compile in C mode

    * Pass parameters from DispatchResult to debugger
    * Fix default trap type (= read)
    * Remove fallout from branch merge

Changed uInt32 to uInt64 in several places, standardizing on uInt64 for cycle-related variables.

-> no more perceivable audio latency
-> fewer underruns

Always make sure that hardware state is consistent with a full step before dispatching  the debugger.

     * Allows to revert much of the complexity of my previous fix.

'ghost' read traps are displayed by 'RTrapG'

update documentation accordingly
removed reload requirements for Time Machine