Create warning flags bitwise enums

[myssto]

Implement the following for warning flags:

• [x] Match

  • Default value of 0 (codified as None)
  • Title regex matching: {T_ABR}: ({TEAM_A}) vs ({TEAM_B}) where {T_ABR} is the tournament's abbreviation. vs check should be loose and cover VS vs., and everything in between (codified as UnexpectedTitleFormat).
  • Match game count is exactly 3 or 4 (codified as LowGameCount).

• [x] Game

  • Default value of 0 (codified as None)
  • If a tournament does not have a stored mappool and the beatmap is used exactly once in the entire tournament (codified as BeatmapUsedOnce)
  • If a tournament does have a stored mappool, and the beatmap is not in the mappool, and the game is not one of the first two games in the match (codified as BeatmapNotInMappool)

• [x] Add WarningFlags to Match and Game Entities

• [x] Create and test migration