Added common token bases

[munanadi]

Wrt. #56

commonBases?: <PublicKey[]> is a prop that can be passed on to the <Swap>
This will show up on top of the list.

The star icon in the token list lets users select their own custom base token apart from the customBases passed as a prop.
The icon also acts like a toggle that reflects the state change also updating local storage.

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I also fixed unnecessary rerenders of TokenDialog. For example it was rendering even when it was not displayed on screen.
Hence used the showTokenDialog bool to trigger its render only when its shown.

This is before using the fix.

This is after we use useMemo to only render when the list is shown

This makes the UI a bit faster preventing rerenders. and the UX a little better I hope.
Let me know what you think! :))

[munanadi]

I did run yarn lint:fix and nothing changes. works fine. any suggestions?

[secretshardul]

yarn lint is behind failed check. Change formatting so yarn lint shows no errors.

https://app.travis-ci.com/github/project-serum/swap-ui/builds/238231690#L239

[secretshardul]

Merged with cyclos-prod