fixed about 100 warnings
Fix snake break technique message for npcs.
Fixes price and weight of landmines.
Tweak.
fix use_function::operator!=
fixed about 100 warnings
Merge land mine price and weight fix.
Merge pull request #4276 from illi-kun/warnings

Didn't I already merge these signed/unsigned warning fixes?
Merge good little bugfixes in #4316 and #4396.

Good catches, guys, thanks for the help!