App state

[Winni-]

Build the UI driven app state management. Should be universal for wasm app or rest backend. Should include futures mentioned in

• [x] #4
• [x] #8
• [x] #15
• [x] #20
• [x] #21
• [x] #22
• [x] #23
• [x] #26
• [x] #29
• [x] #31
• [x] #37
• [x] #34

[Winni-]

Local DB will be not present on front-end as everything will be indexed on back-end.