Used this feature to add x86_64 unwind information.

Use it to add a 256 byte block around current program counter.

dbghelp: Add our own thread data gathering struct for minidump internals instead on relying on SYSTEM_PROCESS_INFO.

'Unicode' and 'UTF-8' are used as is in Japanese (with thanks to Akihiro Sagawa).

It can be smaller than the number of columns found in the table meta data.

The main thing that's broken is the unnecessary color conversion in case bgra
vertex arrays are supported. It shouldn't be hard to fix that, but at this
point I don't think this hack even helps a lot anymore.