Added support to band, added formBand and disbandBand#1

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StErMi wants to merge 3 commits intorockburg:mainfrom StErMi:bands

+620-248

Commits on Sep 22, 2021

Added support to band, added formBand and disbandBand
StErMi
committed

Commits on Sep 23, 2021

Merged with typescript (main), updated band test to support TS
StErMi
committed
updated the RockburgNFT contract to handle band ownership check on disband, added type/role check on fromBand, added more tests
StErMi
committed