v1.9.0

With this release, we are launching Bot Store, which makes discovery and distribution of Byteball based apps (chatbots) easier.

Other updates:

• Fixed an issue that caused full wallets to sometimes crash while syncing
• When receiving blackbytes, now displaying progress (it is slow)
• Checks to prevent duplicate payment to a smart contract
• Multiple new and improved translations
• Multiple visual improvements
• A few small bugfixes