Feat/use editing

[JohanHjelsethStorstad]

Note that this PR branches from refactor/server-folder #206 Till now the edit icon just showed if you were Harambe104, now there is a system in place to determine if it should show or not. This PR does the following:

• requiredPermissions in getUser is now a matrix so one can have and and or statements (it used to be just and), I made this change to mirror the upcoming visibility. Then we will also have a groupVisibilityMatrix.
• Made useUser work more like getUser
• Renamed the files for getUser and useUser and removed the tsx ext. on the latter.
• editModeContext nox has functionality to keep track of all editable content mounted in the dom.
• A new useEditing hook that takes a permissionMatrix (soon also a visibilityMatrix) and uses useUser to determine if the user can edit the content, it returns true if editMode is on and the user can edit the content.
• Changes all useContext(EditModeContext) to useEditing.

[JohanHjelsethStorstad]

Will be replaced by new PR, containing groups and server refactor