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

- Move sound debugging output to logging facilities
- This should fix issue #348, but more testing is required

Bumped version # for beta release.

(some TODOs left, see EventHandler and TimeMachineDialog)

Fixed F8 scheme to not randomize 'special' ROMs (those hardcoded with a certain startup bank).
Bumped state file version number.

RewindManager class refactored for multiple rewinds/unwinds
additional keys for faster rewinding added
docs updated

rewind now displayed immediately (instead of "Paused")
two initial rewinds in continuous rewind mode fixed
Horizon widget disabled when Uncompressed size == Buffer size
fixed minimum Interval

changed values, UI and settings for rewind interval and horizon

(@sa666666 please check if that's the right way to do it)

entering debugger from pause mode allowed (TODO: allow more functions)
"Pause" displays always immediately

- Toggle this with Alt-r.  When enabled, state is saved each frame to memory (up to 100 slots)
- Upon entering the debugger, rewind is immediately available, allowing to rewind (for example) back past a breakpoint
- Testing is definitely required.

- The cycles counter is now essentially monotonically increasing (ie, we never need to worry about it going backwards and giving a negative difference, simplifying a lot of code
- There are now reset() methods in all places that keep track of system cycles, but they are used for a full reset only; not called each frame like before (which had to be done to prevent overflow).

Finalized state file format at 5.0.0.0.

 - Only activates in PAL-like modes (PAL and PAL60)

state files invalid (and cause a crash on my system, at least).

There's still a few final items to fix, but it's 99% complete.

and PaddleReader).  For now, PaddleReader is stubbed out, since
it needs to save double values and Serializer can't do that yet.

Fixed bug in Ball, Background and Playfield serialization; they
were correctly saving data, but returning false (indicating failure).

since it looks like they won't be heavily modified any further.