Add missing spaces to view mode switcher tooltip

fixes #79891

Adopt icon fonts in Search viewlet

fixes #80930
fixes #80366

Emitters should generally not be reassigned as their corresponding event would also be lost. Marking these as readonly just to enforce this

Fixes #80863

- Disable reload action if ui extension is installed on both
- Fix tooltips

Fix microsoft/vscode-remote-release#1426

Fixes #80184

Don't rely on a state being set as well

For #81131

We had trouble coming up with cases where extensions could actually reliably dispose of the resolved uri