Collections UI

[LukeNexusMods]

TODO:

• medium: move collection cards into the library
• Change downloaded optional mods into installable items for collections #2432
• Show "Upgrade to Premium"-modal for free users in collections UI #2444
• Show collection in left menu with toggles #2434
• very long: Use hierarchical tree
• medium: Change download text to "Manual Download" for external files that have been checked and can't be downloaded directly.
• medium: Disable "Download all"-buttons when downloads are already running
• Change item type for installed downloads into "installed download"-type that doesn't have a "Download"-button (Installing optional downloads #2440)
• easy: after installation, hide "Install Collection"-button
• easy: after installation, show "View installed Collection"-button
• easy: Disable "Install"-button when already installing
• easy: styling buttons in toolbar
• easy: after installation, change status text to "Ready to play - All required mods installed"
• unknown: styling download buttons on each item

[insomnious]

Thresholds and Brushes for styling collection rating:

if rating >= 75
  `SuccessStrongBrush`
if rating >= 50
`WarningStrongBrush`
else
`DangerStrongBrush`

[Pickysaurus]

Important note on success rating.
If a collection has less than 5 votes, don't show a rating yet.