Extract main-nav to separate file/component

[eszkadev]

This is an Easy Hack.
Potential mentors: @eszkadev @Darshan-upadhyay1110

Detailed description and rationale

We have couple of really big files which would be good to shorten (eg. Control.UIManager.ts) and clean from legacy code - jQuery.

Please check .main-nav element. It has some handlers attached and also class toggles in various places.
main-nav code. Would be good to bundle them together in a single place.

Tasks:

• create separate TS file -> browser/src/control/Control.MenuAndTitleBar.ts
• put there all related code to that element (.main-nav) converted to TypeScript
• remove jQuery usage
• use it's methods in external code (Control.UIManager.ts, Control.Notebookbar.js, Control.Toolbar.js)

Be inspired by other TS files inside browser/src/control/Control.* files.