Bpytop

* Fixed: Cpu temp color index crash
* Fixed: Start from virtualenv crash

* Added: More sizing adaptation for processes
* Fixed: Clock centering

* Fixed: "view_mode" option entry format
* Fixed: Help menu entries

* Added: View mode toggle with 3 presets, "full", "proc" and "stat"
* Added: Rescaling of net stat box width on smaller terminal sizes
* Changed: Net box height slight increase, mem/disks box height slight decrease
* Fixed: Some element placement fixes by RedBearAK
* Fixed: "delete" and "filter" mouse click area misaligned
* Added: Option to sync network scaling between download and upload

* Some refactoring and cleanup
* README: Info for debian package
* Added: Theme search path for snap install
* README: Updated snap install info

* Fixed: Clean excess whitespace from CPU model name, by RedBearAK
* Changed: README.md absolute paths to work on PyPi