implement variable point referral bonus

[yongwen]

The referral bonus point varies depends on the participation rate of the team where the referred player is in:

1. when the team participation is less than 20%, referral bonus point is 30
2. when is from 20% - 40%, referral bonus point is 20
3. when is greater than 40%, referral bonus point is 10.

This feature should be able to be turned on/off by admin via admin "Referral Game mechanics" interface during the game. The suggestion is that this dynamic referral point should be turned off at the beginning of the game. During the game, once one of the team participation rates hit 40% or less, admin could turn on the dynamic referral point to encourage referrals.

[yongwen]

fixed in Dasha.

under "admin/game settings/referral game dynamic" once check the "start dynamic referral bonus", the system will start using the dynamic bonus based on participation rate.

[yongwen]

enabled in production.