Transfer SOL renamed to Send SOL

[sammanadh]

1. Transfer SOL button renamed to Send SOL
2. Target account input disabled in send sol popup
   With this change there will no way to send SOL to an account without selecting it from ProgramChange comp. Will need to add another ui element using which a user will have the freedom to paste or type any address he/she wants.

[nathanleclaire]

Nice!! CI wants you to take out targetPlaceholder prop in TransferSolButton

error  'targetPlaceholder' PropType is defined but prop is never used  react/no-unused-prop-types

[nathanleclaire]

Closes #185

[sammanadh]

Opps. forgot to add targetPlaceholder in props destructuring. just added.

[nathanleclaire]

one more ask on this one --

Since the "From" and "To" fields cannot be modify -- can you please change them from being an <input> to a <code>?

And also label them, so that "From" says something like (Your Wallet) by it, and "To" says something like (This Account)

Thanks!

[sammanadh]

@nathanleclaire Have change input to code. Looks like this:

Also, have done some refactoring to make prettifyPubkey "importable"

[nathanleclaire]

Nice!!

LGTM