Fix buffer overflow when linedef type 415 executes

When linedef type 415 executes, there's a risk that the game segfaults or executes arbitrary code due to the lump that contains the script is not guaranteed to be NULL-terminated (in fact, I've found that that's rarely the case). The fix simply creates a temporary buffer to store the script in and adds a NULL-termination to it.

added Bug label

changed milestone to %2.2.14

added 665 commits

• 8919b35b...a68440c4 - 664 commits from branch STJr:next
• 41fbfda8 - Merge branch SRB2:next into fix-line-415-buffer-overflow

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mentioned in commit d1ce8dee