stack overflow in 'parse_args'

[Smattr]

At time of writing (latest commit d71be3a), parse_args includes the following:

size_t raw_len = strlen(argv[i]) + 2; // NULL byte and the potential space
wchar_t text[raw_len];  // Upper bound on size

This appears to allocate a buffer on the stack whose size is determined by user input. For a very large command line argument, this will most likely overflow the stack. Maybe this should be malloced instead? Apologies if I’m misreading something here.