PLAT-539: added a char * version of backtrace, suitable for use in a buffer
PLAT-539: added a char * version of demangle, suitable for use in a buffer
PLAT-539: log exceptions in one shot on stderr, to reduce the risk of display confusion, also avoid allocations when std::bad_alloc is thrown
PLAT-539: small adjustments after PR review
Merge branch 'PLAT-539_exception-mishmash-bis' into PLAT-539_exception-mishmash

Conflicts:
	arch/exception_handler.cc