[S0ly]

Built on top of #511, only the last two commits are new.

• Every RTS match is recorded to a zipped .ronreplay (singleplayer, P2P host and dedicated servers)
• Replays button next to Tutorial: list with map, players, winner, duration and mod version, plus watch, delete and open folder
• Playback has every spectator feature (fog toggle, view as player, camera follow, minimap) and a time bar with play/pause, 0.5-8x speed and click/drag seeking
• Replays from another mod version still play, with a warning
• New end screen: victory/defeat in the launcher colours, overview/economy/military tabs, army chart, highlights and a replay download button
• New stats: kills, units lost, buildings destroyed/lost, peak army