Add --enable-asan & --enable-ubsan. By default disabled. #352
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To enable sanitizer.
Reading the net, it seems that -g -O1 is also very helpful to read the trace.
Also this is good to have a stack trace and halt when there are problems:
export UBSAN_OPTIONS=print_stacktrace=1:halt_on_error=1
to execute before running bzflag
No check is performed to see if the compiler actually respect those flags or faults (To be added in future)