Remove or depreciate unused methods in ElementBrowser
There are few methods in ElementBrowser which are never used in the core.
We should remove or depreciate them.
[TASK] Deprecate unused methods in ElementBrowser
There are 3 methods in ElementBrowser which are never used in the core.
We deprecate them, so they can be removed two versions later.
The methods are: * checkFolder * isWebFolder * setRecordList
Reviewed-by: Markus Klein
Tested-by: Markus Klein
Reviewed-by: Oliver Klee
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters