Improve tray icon images

[ns6089]

1. Adds generator script
2. This script uses special packer that forces png compression, reducing the resulting .ico file sizes tremendously
3. Also uses optipng to reduce the size around 20% more
4. Since the sizes are reduced, we generate the icons for all non-custom dpi scaling values
5. Renames favicon.ico to sunshine.ico, since it's now used in other places such as tray icon

Description

Screenshot

Issues Fixed or Closed

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update (updates to dependencies)
• Documentation update (changes to documentation)
• Repository update (changes to repository files, e.g. .github/...)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the in code docstring/documentation-blocks for new or existing methods/components

Branch Updates

LizardByte requires that branches be up-to-date before merging. This means that after any PR is merged, this branch
must be updated before it can be merged. You must also
Allow edits from maintainers.

• I want maintainers to keep my branch updated

[ns6089]

Waiting for LizardByte/tray#5

[ns6089]

Waiting for LizardByte/tray#5

Done. This is now ready too.