Update versioning to 3.4

[lothsun]

Update mod version to 3.4 across all files. (mission server, config, types, spawnabletypes, etc.) Do this last before release.

[PackJC]

3.5+ now

[lothsun]

Issue not completed and files not updated to reflect new versioning. To be completed as the last item before release. Current steam release version is 3.3. Next release version would still be 3.4