Simplify main markor UI

[harshad1]

People have occasionally complained about something or the other as long as I have been contributing (swipe issues, vertical space etc etc etc)

I too feel that the main UI needs improving. My proposal is this:

1. We completely get rid of the bottom navigation bar
2. We add 2 FABs to launch quick note and todo.txt. they will launch into their own documents as normal.
3. The main activity is reduced to only a file browser

This will:

1. Speed up main activity launch considerably
2. Simplify and unify the UI components
3. Completely avoid the vertical space issues
4. Avoid issues with the keyboard showing up on top of the file browser

The paradigm of having 2-3 FABs is already used in markor (file browser fragment, widget)

I will be able to implement this, but I would like feedback first.

[harshad1]

I have made an experimental PR here: #2589

Feedback would be appreciated

[PIXEL-PEN]

I have no problem with the current layout. I can't see how this would be an improvement. But since I've started using my calendar applet I seldom enter Markor via the main navigation screen.

[harshad1]

The tab bar takes up vertical space. This is a little cleaner imo.