Notably the Node tool, which has a lot of complicated tooltip
interactions. I did not try to solve it in the ideal way, because I
started going down that track but realized it would take a while.

So this commit just does the more targeted thing, which is update the
tooltips to be dynamic, but not entirely break us from the manual
combinating of modifier labels. Ideally it would all be handled for us
by some helper methods.

I broke a lot of keyboard shortcuts with a recent accidental confusion
between keyvals and modifier flags. This should get keyboard shortcuts
like "moving with arrows" (and others) working again.

Fixes #6226

It had an expander inside the popup, and when a popup wants to grow,
gtk4 will close it instead (popups shouldn't change size).

So instead, this commit drops the expander (it's just for one field)
and adjusts the spacing around the popup too for simplification.

Fixes #5820

For vector outputs, the following now work:
* --export-area
* --export-area-snap

For png outputs:
* --export-area-drawing will now be respected even if you pass in an
  --export-id.

And now the vector, png, and other-raster code paths all use the same
function for export area and export ID handling.

This change does not make other-raster code paths support --export-area
yet, but it should get us closer.

Fixes inkscape/inkscape#678

This commit moves up when we try to restore window size to "as early as
possible" so that attempts to show the window during initialization
(like can happen if dialogs try to be shown) don't cause the window to
store its in-progress size in prefences, which then get loaded.

Instead, we load it up front, and later attempts to show the window
are just fine.

This commit also makes two behavior changes, both of which I think are
desirable:
- Detaching a tab into a new window (either by right clicking on tab
  name or dragging it out of the window) will now follow "new window
  sizing rules".
- Opening a "new template" document will no longer attempt to resize
  your current window to match the "new window sizing rules" -- it's
  already an open window, we shouldn't resize it.

Fixes #6229