Break app into frontend, backend, and middleware

Right now the app is a monolith and the frontend/backends are closely coupled together.

[ ] Remove all ipcRenderer calls on the frontend with generic action methods
[ ] Move the ipcRenderer calls to the generic action methods with IS_ELECTON checks
[ ] - [ ] Abstract logic in ipcRenderer calls to middleware methods
[ ] Add logic for using Express or GraphQL when IS_ELECTRON is not enabled

The final result should allow logic to be shared between web and electron and minimal scaffolding have to be added to support both platforms.

Something like:

ipcMain.on('/lightning-account-data', () => {
   const data = getLightningData(args);
   event.reply("/lightning-account-data", data);
})

express.get('/lightning-account-data', () => {
   const data = getLightningData(args);
   reply(data)
})

Lily-Technologies / lily-wallet