PayButton-Server v3.0.0

Added support for SideShift.ai (server-side integration), added option to export button history as a CSV, and re-implemented support for BCH using the new BCHC indexer - powered by Chronik.

What's Changed

• Feat/get tx by paybutton by @lissavxo in #835
• feat: get tx by paybuttonId by @lissavxo in #837
• Feat/return raw opreturn by @lissavxo in #839
• feat: sideshift ws endpoint by @chedieck in #840
• Fix github workflow by @chedieck in #844
• feat: BCH using chronik by @chedieck in #843
• Feat/download transactions file by @lissavxo in #841
• feat: button download txs by @lissavxo in #845
• fix: throw if price request fails by @chedieck in #815
• Fix/expected res for prices by @chedieck in #854
• chore: don't seed in prod by @chedieck in #852
• Deprecated yml version line removed by @Klakurka in #853
• fix: value fixed decimal by @lissavxo in #849
• feat: txs CSV value header shows units by @chedieck in #856

Full Changelog: 2.1.0...3.0.0