Add "Injury" to match events#182

Create an option similar to cards/goals for a quick capture of the details of a player injury (team, minute, player #, and location of injury: head, upper body, lower body). In youth games, we have to make a note of any major injury or when a player does not return. An event on the game record can help us remember these moments.

We are required to report all inuries during a USSF youth/amateur match.