BBR Helper

Description

This provides the "game score" on multiple pages:
- average GmSc by season on the player page
- average GmSc by playoff series on the player page
- average GmSc by player on the team_season page
- average GmSc by player on the team_player page
- average GmSc by player on the season_player page
- single game/half/quarter GmSc by player on the game_boxscore page
- single game and average GmSc on the head-to-head finder page
- top 5 and top 20 average GmSc players on the season page
- top 20 average GmSc players on the team_season page
- top 20 average GmSc seasons rankings on the player page
- top 50 career GmSc rankings on the player page
- multiple GmSc rankings on the leader page

Game score is calculated as:
"""
gmsc = (pts + 0.4 * fg - 0.7 * fga + 0.4 * ft - 0.4 * fta + 0.7 * orb + 0.3 * drb + 0.42 * (trb - orb - drb) + stl + 0.7 * ast + 0.7 * blk - 0.4 * pf - tov) / g
"""
, where orb is treated as 0.3 * trb and drb is treated as 0.7 * trb approximately when stats are not complete in early years.