Attempted Field Goals are Special Teams Play

[jdpretorius123]

Hey,

I found inconsistencies in the variables special and special_teams_play. Some field goal attempts are not considered special teams plays. There should not be any made/missed field goals, or field goals that were attempted and blocked with a 0 in special and special_teams_play.

> table(pbp$field_goal_result, pbp$special, useNA = 'always')
         
                0       1    <NA>
  blocked       3     584       0
  made          8   22983       0
  missed        2    4193       0
  <NA>    1079689  172166       0
> table(pbp$field_goal_result, pbp$special_teams_play, useNA = 'always')
         
                0       1    <NA>
  blocked     481      56      50
  made      19924    1539    1528
  missed     3419     408     368
  <NA>    1014346  147828   89681

[mrcaseb]

This is essentially a play_type issue that I hope is fixed through #568 but I need to double check.