Release of Testnet 4

• [feature] All: 1 BEAM now worths 100M GROTH
• [feature] Miner: mining algorithm changed to Equihash 150,5 with custom data path
• [feature] Miner: openCL miner for Equihash 150,5
• [feature] Desktop and CLI wallets: Increased communication stability (SBBS)
• [feature] Node: new key management mode for mining: https://beam-docs.readthedocs.io/en/latest/rtd_pages/user_mining_beam.html
• [feature] Desktop wallet: non-expiring addresses are supported now
• [feature] Desktop wallet: node connectivity indicators
• [update] All: new parameters introduced in respective configuration files
• [docs] All brand new: https://beam-docs.readthedocs.io/en/latest/
• [bug] All: multiple bugfixes and UI improvements (see our Github for details)