Message App UI simplicity

I updated smessages to depend on the default messages app instead of duplicating code.
New caveats:

• This is mostly just a big change to deduplicate the library code: it works, but you might want to wait a few days for me to polish it some more.
  
• I moved the widget code to a separate app (PR)
  
• It now depends on the default app, the installation procedure now is
  
  

1. Install the default messages app from my repo - you need the version from my repo, as it depends on some library changes that are only present in the storage file version.
   
2. Install the smessages app from my repo
   
   

Edit: icons are fixed now.