Daily challenge scoreboard should reset everyday.

[FredericRezeau]

The issue is that players coming in late start at a disadvantage for the daily challenge and this affects the retention and participation on games because new players get discouraged.

Resetting all scores daily is not a viable option either for most games as many require several days to complete (e.g. Idle Brainz, Tap the Frog) so we would greatly be limiting the "playable" content.

To solve this, the idea is to highlight a daily score for the top 3 players with a daily reset. Game developers can choose how this daily score is computed (% change from previous day, Specific Level etc...) so this will allow challenges to be run much more efficiently.

[FredericRezeau]

Fixed with implementation of Live Challenges
f3eb53c

Live Challenge Features:

• Each game can enable Challenge mode.
• The game specifies a custom period interval.
• The game specifies a custom list of rewards and amounts (any SDEX asset is accepted).
• The game specifies the scoring requirements.
• When in Challenge mode, the game leaderboard in Litemint shows the top 3 players for the period.
• At the end of the period, the rewards are automatically distributed to the winners and the score is reset.