Duplicate code for pausing, unpausing, removing items

[Bjonnfesk]

Dossier uses its own code for pausing, unpausing and removing items:

https://github.com/Koulis2000/MCScripts/blob/2cab7ac9e6ae84828c9103f0acb3eb29f155f8ba/CCTweaked/janus-dossier.lua#L84-L127

This is duplicate code, as the capability to do that already exists in janus/commands.lua. Dossier should call these existing methods instead.

[Koulis2000]

The commands.lua file actually uses these functions to pause/unpause/remove items when provided only with a name. Maybe I should move them in that file.

[Bjonnfesk]

Then this issue is even deeper. That means at least some of those functions in commands.lua are loading and saving the requested items file twice per operation.

[Koulis2000]

I have reworked the whole file. Will push the changes after I do some testing.

[Koulis2000]

Moved all the related functions to commands.lua and reduced janus.load() and janus.save() calls significantly.