Add replay parsing using mgz to determine openings

[jerkeeler]

Use the amazing https://github.com/happyleavesaoc/aoc-mgz project to parse replay files and store openers for each match and player.

On the civ page:

• [x] Add which openers are used and win rates
• [x] Track opener win/paly rate per patch
• [x] Average advance times to the next age
• [ ] Most common units?

On the map page:

• [x] Add which openers are used and win rates

On insights page:

• [x] Track win/play rate of openers per patch
• [ ] Determine "meta" somehow