Key chord for view-mode
Change key for python shebang snippet

Key used to be '#!', but on update giving error:

  [yas] elisp error! Symbol's function definition is void: ca-all-asscs

This is coming from the text-mode/bang snippet with the key "!".
`ca-all-asscs' is defined in Andrea Crotti's snippet repo:

https://github.com/AndreaCrotti/Emacs-configuration/blob/01ac040840ceba0a909317046e8a83867aea1022/modules/ca-utils.el#466-473

Changing key for python snippet to 'sb' to avoid conflict.