The active codes normally get cleared when a game boots, because
LoadPatches gets called, replacing the codes from the previous game.
However, there were cases where LoadPatches doesn't get called, and
then codes from the previous game would be used for the current game.
This commit clears the codes on shutdown so that it doesn't matter
whether the boot process loads LoadPatches.
ISOProperties loads codes using ActionReplay::LoadCodes which actually applies
the codes to the global state. If a game is running then that games receives
all the codes (and ACTIVE status) from the second game being shown in
ISOProperties which is not desirable.
The PowerPC CPU has bits in MSR (DR and IR) which control whether
addresses are translated. We should respect these instead of mixing
physical addresses and translated addresses into the same address space.
This is mostly mass-renaming calls to memory accesses APIs from places
which expect address translation to use a different version from those
which do not expect address translation.
This does very little on its own, but it's the first step to a correct BAT
implementation.
