Scroll Synchronisation activation method reimplemented

Aditya Tolikarrequested to merge
ulterno/kate:ScrollSyncAdditions into master

Removed Scroll Synchronisation QAction from Split View menu and added a ToolButton to the Tab Bar
Made a single Scroll Synchronisation QAction for the Main Action Collection (hence user-hotkeyable)
Set an existing icon for Scroll Synchronisation

Edited by Aditya Tolikar

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