This PR adds the capability to reorder tasks (in the list view), lists in the menu and buckets in the kanban view.
I've also thrown out the kanban library and rebuilt the whol thing with sortablejs. It now uses less code, is more performant and finally works on mobile without bugging up after a while.
Related issues: #115, #476, #115, #615
Related API PR: vikunja/api#923
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