Fix interact logic with relation to sneaking

Fixes #405
Remove duplicate dependency
Prevent opening new silent inventory if one is open

Might help #413
3.18 release
Version to 3.18.1-SNAPSHOT
Update README

License is in the LICENSE file
1.6.1 support
Version to 3.18.1 for release
Update to 3.18.2-SNAPSHOT
1.6.2 support
3.18.2 release
Version to 3.18.3-SNAPSHOT
Versioning
Eliminate two repos.
Get prefix, not suffix. Apparently this feature is unused.
Update updater for updated updating
1.6.4 support
Version to 3.18.3 for release
Version to 3.18.4-SNAPSHOT
Shrink the dependency tree.