[FEATURE] Add configurable link maker and image maker buttons

Remove also some obsolete VH

Change-Id: I1bdd1d7a6c7fb172b70c2c5f337bfacecc45d2b8
[FEATURE] Restore Link Maker and Image Editor

Change-Id: I9baee70fe54d0be5418375377aba723b6ae25d0f
[TASK] Rename plugin to "ImageEditor" and "LinkCreator"

Change-Id: I8cf61cda2bbd813b3ea0d29016fa5ce5befb60ed
[TASK] Rename some ViewHelpers

Change-Id: I95b3e39ab1fd9ae80c72dc7c944dc3ea1fe1224c
[TASK] Remove some unused stuff

Change-Id: I75517bba38543200286866d7c36b9d3f21b05840
[TASK] Re-locate file upload code

Change-Id: I825b2542d2be2a118ae5b991a692f7795b101847
[TASK] Rename directory to "Stylesheets"

Change-Id: Ia1a6023090b11979c69331d7d31003a9f0204231
[TASK] Rename variable "assetIdentifier" to "fileIdentifier"

Change-Id: I2e2213a3c8faf135a90e4328a57316359d094863