Allow commands to target offline players (#1022)

* Add targetRequirement annotation for Command

* Added MTL lines for other langs

* Fix TargetRequirement enum scoping

* Adjust commands to targetRequirement system

* Add translation message sugar to prevent future messages from being translated for wrong player

* Temporarily disable offline targeting on /permission and /clear

* Preliminary README cleanup

* Readme commands cleanup

* Clean up command table in README, including column shuffle

Co-authored-by: AnimeGitB <AnimeGitB@bigblueball.in>