Separate UI library module for apps

[AliYusuf95]

Is your feature request related to a problem? Please describe.
What I want to achieve is to embed tindroid chat into my application and use a self-hosted tinode chat server.

Describe the solution you'd like

• Creating separate UI library module that can be used in apps; something similar to Stream Chat Kit
• Add prefix to the resouces included (to avoid conflicts)
• Use the UI module in the app
• Publish the SDK and UI libraries using jitpack or Maven Central

Additional context
Currently, I do part of the modifications manually each time I want to update the version to support new features and fixes. However, it's not fully integrated with my app (styles, navigation, etc..).
This also would help in implementing multiple apps/flavors that can support different stores #99.

If this is in the scope of the project I'm willing to help.

[or-else]

We are not going to do it ourselves, but we will support you if you do it. The goal should be a kit/module which we can use in the Tindroid app (and elsewhere).

[or-else]

Please use devel branch for pull requests, master is usually behind.