Closes#81
- Ported ZcashHoldToSendButton from ECC referecne wallet and make it work with TCA. And then use it on Send Confirmation screen.
- Added colors that are used by HoldToSendButton to asset catalogue.
- Update Send confirmation screen look according to designs.
- Ported ZcashCheckCircle from ECC reference wallet and use it on Send confirmation screen.
- Added colors used by CheckCircle to assets catalogue.
- Add test for the case when not including memo in transaction.
- Updated ZcashLightClientKit to 0.16.10-beta to fix transaction failure when memo is nil.