RRTTI

@wirednkod a new call on tips pallet was added with the last runtime upgrade: `slash_tip` - Remove and slash an already-open tip. This call allows us to deal with any...

Adding my thoughts on this: - the UI should allow users to see which lotteries are active and which calls are included (itll be one lottery per period (28 days)...

@gavofyork PR is queued for audit starting mid-next week: for a week. I will update as auditors work on it.