TIP-93 part 4: mandatory 30-day delay on fee changes

Following extensive deliberation by Threshold Treasury committee and then the community (see Forum discussion in link below), this is the last of 4 snapshots that cover the facets to be decided (mint fee, redeem fee, Treasury committee authorization, 30-day delay for fee changes), while avoiding inevitable "split votes" by trying to combine them.

The Treasury committee recommended a 30-day delayed implementation should TIP-93 be approved, stating: "We include a 30-day delayed implementation following Snapshot vote results, partly to give the market time to respond and as a consideration f…