619 restructure local storage (#628)

* To MMKV migration working

* POC migrated font size settings

* Moved settings to mmkv

* Fix typos

* Migrated contexts slice

* Migrated app slice

* POC instance emoji update

* Migrated drafts

* Migrated simple instance properties

* All migrated!

* Re-structure files

* Tolerant of undefined settings

* Can properly logging in and out including empty state

src/components/Menu/Container.tsx

@@ -1,6 +1,6 @@
+import { StyleConstants } from '@utils/styles/constants'
 import React from 'react'
 import { View } from 'react-native'
-import { StyleConstants } from '@utils/styles/constants'
 
 export interface Props {
   children: React.ReactNode