Fixed grammar/vocabulary and improved balance
Mission 7: Added more pickhammers so that it's harder to run out of them, added more weapons to the AI
Mission 6: Removed reset possibility, added sticky mines, more weapons for AI every six turns
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fix for
issue #293 : "rope stuck after picking crate"
fix a segfault related to tcp servers deleting themselves without removing themselves from the internal server list first.
(e.g. happens if game fails to start due to missing hwengine binary. a second start attempt will lead to a segfault, even if you correctly install the binary.)