cursors: link dnd-move to default

See merge request !67

See #286

Windows: fix wrong cursor install location

See merge request !66

build: Reinstate symlinks from legacy names to closest CSS names

Closes #278

See merge request !65

Before commit 74e9b794 "cursors: only use gtk/css names", each cursor
was available under several names: the traditional/legacy X11 cursor
font name (which was treated as canonical), the CSS/freedesktop.org name
if any, and various other traditional/legacy names.

Eliminating the non-CSS cursors such as dotbox doesn't mean we can't
still provide the traditional X11 cursor font names as aliases for the
CSS/freedesktop.org names (which are now treated as canonical). This
considerably improves interoperability with non-GTK toolkits and
applications, some of which have historically looked up cursors by their
X11 names: for example, Firefox before 123 and SDL before 2.30.1
did this.

The non-cursor-font-based aliases that were present in Adwaita 45
(additional traditional/legacy names possibly originating from
Qt such as size_fdiag, and hash-based libXcursor names such as
c7088f0f3e6c8088236ef8e1e3e70000) have been excluded here, as requested
by Jakub Steiner in !65.

Fixes: 74e9b794 "cursors: only use gtk/css names"
Resolves: #278


Signed-off-by: Simon McVittie <smcv@debian.org>

- the export from sheet includes search and help-about

Fixes #277

- revert the metaphor change

See #259

cursors: Tidy up of the source sheet; fix a couple cursors

See merge request !64

- clean up the shapes of cursors and align them to the pixel grid
- fix incorrect direction on not-allowed icons
- fixed asymmetry in the corner adjustment cursors
- reworks the shadows layer so all shadows are consistent
- added a silhouttes layer for ease of making adjusting shadows

- sync the aesthetic of `not-allowed` with the remaining set (zoom* and
  no-drag, copy...)

- update windows cursors to the latest css spec

- replaced by alias (in src)

cursors: Sync metaphors with macos

Closes #272

See merge request !63

Fixes #272

"Notář mi vyprávěl, že dědeček byl vyhlášený samotář. Lidem se vyhýbal a nikoho
kolem sebe nesnesl. Ale odjakživa toužil stát se hostinským. Nejdřív si otevřel
hospodu u silnice na Písek. Ale chodili mu tam lidi."

- avoid using a doubl negative metaphor for mark junk

See evolution#1710 (comment 1924546)

Fixes World/design/icon-library#55

cursors: only use gtk/css names

Closes #251

See merge request !61

- big cleanup of the cursor set. Only names defined by gtk/CSS:
  https://docs.gtk.org/gdk4/ctor.Cursor.new_from_name.html
  https://developer.mozilla.org/en-US/docs/Web/CSS/cursor
- Mutter will fall back to `default` if a cursor isn't found. See
  mutter!3295

  Fixes #251

- the new style dictates outlines wherever possible

- avoid multiple (i) icons

Fixes #259

- anti-alias edges a bit more to strike a balance between sharpness and
  people feeling it's the 90s again.

Fixes #258

meson: Create duplicate cursors via symlinks at install time

See merge request !60

In !49 (Commit 7a5dc9d5), the duplicate cursors (aliases for cursor
names) were switched from being symlinks to being copies to avoid
problems with using symlinks with meson's `install_subdir` function.
However, copying the cursors needlessly inflates the size of the
distribution tarball and distribution packages.

The cursors are only installed on unix-like systems, so the symlinks
themselves are not a problem.

To solve this problem, I have deleted the duplicate cursor files, and
set up meson to create the required symlinks at install time. The list
of symlinks to create is derived from the list of copied symlinks from
the `make.sh` file (it has been updated to no longer create the copies).

rm unused and problematic .icon-theme.cache

See merge request !59

This file was probably inserted by mistake. It serves no purpose.