Transactions UI updates

[dkackman]

This PR will fix #302

It adds:

• a list view for transactions
• search capability
• the ability to order by block #

Also

• aligns some ui elements between transaction, nft and token pages
  • this involved a refactor of the token ui components so all three follow the same pattern of having an options component (with search, view options etc) separate from the individual views
• makes settings available from login screen (to change network without having a wallet or logging into one)
• replaces the useWallet hook with WalletContext since it is shared state across the majority of components.
• improvements to the nft page
  • copy address toast
  • display attribute urls as links
  • force wrap for long attribute values
• keep the paging control on the top of the transactions and nft list pages for easier paging
• search by nft id
• search transactions by block id
• add dexie link to token context menu