Gnome 46 support and Panel theming

[orhosko]

Description

This adds basic support for gnome 46. However, it requires changes and decisions, so help is required.

Fixes #878 #871

Type of change

• Bugfix (Change which fixes an issue)
• New feature (Change which adds new functionality)
• Enhancement (Change which slightly improves existing code)
• Breaking change (This change will introduce incompatibility with existing functionality)

Changelog

• Gnome 46 support:

  • for template i copied 45/ and added missing values.
  • for submodule part waiting this pr to merge.
  • Contrast mode set as normal for now. If there is a need, ui and template should be updated.

• Panel theming:

  • For a temporary fix, it uses the same color as trays. I believe it can be edited using css and if there is a need it can be discussed in separate issue.

Testing

• I have tested my changes and verified that they work as expected

I haven't tested for earlier gnome versions.

[github-actions]

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[nxs-neo]

Removing this line made it work for me. I am running Gnome 46.2. I am not actively involved in this project, so I don't know if there is a file named _default-colors.scss somewhere, but I couldn't find one.