Block page review

[avive]

• Title: specific details for this block -> Block [short_hash].
• Subtitle: specific details for this block. -> Details.
• Block Number - make 0 for now. This will be the index of the block in the layer once the api supports this.
• Remove block end timestamp row.
• Change block start timestamp label to block time.
• Make the layer data item clickable to view this layer's page on click.
• Make the epoch data item clickable to view the epoch's page on click.
• Total Transactions -> Transactions.
• Total Rewards -> Rewards.
• Missing field: Smesher - The smesher who submitted this block to the mesh. Linkable to smesher's screen.
• Finality: 0% if layer is bigger then verified layer number. 99% if layer is equal or smaller to verified layer number.
• Total rewards data item: numerical. If no rewards then display 0 instead of --.
• Total rewards value data item. Units is coin. If 0 then display 0 SMH instead of --.
• Hash - display full block hash but w/o all the trailing 0s.
• Callout area: Total Coin Rewards: - remove : from label (like we did for all other screens). txns -> Transactions.
• Fix the number of transactions in callout. It is currently constant 000 even for a block with transactions. see: https://stage-explore.spacemesh.io/blocks/0x58163b6e2fed2130bbbeabb2f3a4e99202d5ac3e000000000000000000000000

[despablos]

Fixed all, except:

1. Missing field: Smesher - The smesher who submitted this block to the mesh. Linkable to smesher's screen.
2. Hash - display full block hash but w/o all the trailing 0s.
3. Fix the number of transactions in callout. It is currently constant 000 even for a block with transactions. see: https://stage-explore.spacemesh.io/blocks/0x58163b6e2fed2130bbbeabb2f3a4e99202d5ac3e000000000000000000000000

This issues will be fixed, after back-end fix.