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".