Bad memory access handling improvements

[hrydgard]

Does a few things:

• Splits CORE_ERROR into CORE_BOOT_ERROR and CORE_RUNTIME_ERROR. The latter is intended for unrecoverable errors that happen at runtime. If recoverable, we can use CORE_STEPPING (as currently happens when hitting a bad memory access in the interpreter with bIgnoreBadMemAccess off.
• Centralizes some of the memory access handling code in the interpreter
• Formalizes the notion of core exceptions, adds a place to store information about them
• Displays crash information, crash.prx from Exception handler - catch bad memory accesses by the JIT #11795 shows this in the interpreter with bIgnoreBadMemAccess off:

Note that this only works for interpreter right now. The JIT will get support for this later, partially for fastmem on with #11795 and later for fastmem off. I hope to also make some much improved crash reporting and ideally never have PPSSPP crash just because a game crashes.

[zminhquanz]

#10897 Is it workaround about this @hrydgard ?

[unknownbrackets]

This won't directly fix any crash in any game, but it may prevent game crashes from resulting in PPSSPP crashes, so it may make it easier to fix game crashes.

-[Unknown]