feature: polish the map rotation and server plugins cards

[lukepolo]

Makes the dedicated server Map Rotation and Plugins cards match the rest of 5Stack and fixes the review findings.

• Rotation: poster rows, drag to reorder, Shuffle / In Order toggle, Boots First marker, catalog and workshop rails, contained save bar with Cmd+S
• Plugins: shows whether each plugin loads on this server and why; pending changes are marked; mode plugins are locked
• Deleted maps are hidden, "Played by" matches what the api actually loads, Enter can't import twice, edits made during a save are kept
• Cards sit side by side on wide screens and are hidden for csgo servers
• Fixes the 500 from the Plugins card reading its plugin list before it was declared

Tests: new component specs for both cards (the 500 reproduces without the fix); i18n 16/16.