Avoid unaligned memory access in the PSM loader

[ccawley2011]

This can cause crashes on older ARM processors, as well as on newer ones with alignment exceptions enabled.

[sezero]

There are many other places in code that does foo = *(DWORD *)src; (or
foo = *(WORD *)src) which are potentially unaligned accesses. I ended
up with this yet-incomplete and to-be-verified patch: patch.txt.

ReadSample() of sndfile.c possibly needs similar love & care, not sure.
And several of the loaders would need revising for endian and alignment
safety.

[AliceLR]

Does #pragma pack(1) on the affected structs not already fix this?
edit: seems whether or not this forces the compiler to emit unaligned access safe code might be target-dependent.

[Apaczer]

@ccawley2011, thank you immensly! It helped almost fully to eliminate PSM_Load errors on ARM32 device!.