Lens related updates and removal of old classes

[Andrerm124]

Changelog

• Removed old unused classes
• Entirely rewritten the lens selector
• Added lens filter/searching
• Added long press lens for action menu
• Lens action menu contains; lens rename, rename to default, lens permanent delete
• Added Lens DB merger

[Andrerm124]

I'm assuming you're referring to Killed Snapchat On Preference Change with your first point. I actually made a typo when it first said "Kill Snapchat ..." because the system is actually killing snapchat automatically, not asking the user to kill it (This is a toggleable setting).

I had originally used the RecyclerView in a layout and for some reason it was telling me that I had to add the dependency but now that I'm programatically creating the View it doesn't seem necessary anymore

Update

I had actually forgotten to push the latest commits from my test branch - I've done that now and this PR is ready to merge if you're happy with it