toolbar: Improve menu actions discoverability and disposition

We have some background menu items available in the pathbar buttons
such as "Select All" or "New Folder", however we decided to duplicate
some of them into the hamburguer menu for better discoverability.

Not sure if this is a long term plan, but for now it will fix the issue
of discoverability of those actions.

Since the hamburguer menu now mixes actions from different contexts, we
can rearrange a few other menu items from the view menu to the
hamburguer menu, specially those that are not related to the view like
"show hidden files".
3 jobs for master in 8 minutes and 3 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #207832
flatpak devel

00:07:11

9.3%
 
  Deploy
passed #207833
pages

00:00:51

passed pages:deploy

00:00:00