Feature: Add Toolbar button to show context menu (of selected file[s])

### What's the Problem?

Using a touch screen I always missed the possibility to open context menus easily

### Solution/Idea

In the toolbar, where Copy, Cut, Paste, Rename, and Delete is located, there could be another button, that just opens the context menu of the selected file(s).

When using a touch screen, you have to "hold" a touch click to open a context menu. I always find this a not perfect solution. Such button would make life easier for touch users like me.

### Alternatives

In MS Office, if you select text (or a cell etc.), next to the selection an automatic short context menu appears. Maybe this wouldn't be a bad idea.

Like, if the file is selected with touch, the context menu (or a short context menu, with expand button or so) appears automatically next to it.

If we use this approach, the context menu should (like in office) be not so prominent, like opacity<1-ish. Also, the context menu shouldn't prevent the user from doing other stuff (like selecting the next file etc.)

### Priorities

| Capability | Priority |
| :---------- | :------- |
| This proposal will allow touch users to open context menu without long click. | Must |
| This proposal should not make the work experience of users without touch devices worse! | Should |

### Files Version

v2.0

### Windows Version

Windows 10 Pro - 21H1 - 19043.1165

### Additional comment

Side note: Windows 8 had a very practical solution for this. When Windows 8 intially added Tiles in their start screen, you could scroll sideways. But if you swiped the tiles up and down you could select/unselect the tiles. In Windows 8 that also meant that the "context menu" (in Windows 8 it was a bar that appeared at the bottom of the screen) automatically appeared, when a Tile was selected.

It was not very "beautiful" but was actually very practical.

When in Windows 10 the whole convention shifted from sidescroller to vertical scroller again, this method of selecting tiles was dropped. From then on it was harder to select tiles.

Anyway, in the "Desktop World" (like classical Explorer) it was always the same (at least from Windows 7 onwards), long click/tap to open the context menu.

Depending on the circumstances it can be troublesome to do this long tap.