[Bug 48725] New: Build, package and distribute the themes created by ReactOS project

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=48725

Bug ID: 48725
           Summary: Build, package and distribute the themes created by
                    ReactOS project
           Product: Wine
           Version: 5.3
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: uxtheme
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Wine has capability of theming using `msthemes` files. But none are available
in the distro.

ReactOS contributors have created some libre themes.
https://github.com/reactos/reactos/tree/master/media/themes

It'd be nice to build and package them, since extracting them from ReactOS is
inconvenient

Proposed ways to implement it:
1. Each theme should go into a separate package.
2. There should be a vurtual package triggering installation of all themes
packages.
3. The themes should be moved into a separate repo.
4. Since the themes are built with CMake, CPack should be used to package them.