Style and performance improvements

[Gauravjeetsingh]

• Use fontawesome icon fonts for next and previous button
• Add a loader when changing the ang
• Add custom gesture; double tap to enable/disable larivaar assist
• Implement caching of API requests

[theamanjs]

Please put a valid description of what are the main changes this PR is introducing veerji.

[Gauravjeetsingh]

Done veerji