Add a sort button to column header

[cssuh]

Adding a sort button to each column header and removing it from the filter menu:

 Behavior:

(also replaced old sort indicator assets)

[github-actions]

PR Changes

Category	Main Branch	PR Branch	Difference
Code Coverage	50.40%	50.48%	$${\color{lightgreen} .08\% }$$
VSIX Size	12161 KB	12130 KB	$${\color{lightgreen} -31 KB \space (0\%) }$$
Webview Bundle Size	3180 KB	3124 KB	$${\color{lightgreen} -56 KB \space (-1\%) }$$

[cssuh]

Marking as draft because I still need to sort out some multi-column sort scenarios, and will continue work after ask mode.