Detect mobile dapp browser app and provide custom button

[jackjdleslie]

What is this issue about? (select one)

• [ ] Bug report
• [ ] Feature request
• [x] Enhancement

Issue Description

If you use manager.balance.io on mobile, you either:

1. Use Safari (or something similar) and get the option to connect to Trust Wallet, which does nothing at the moment, and use WalletConnect
2. Use Trust Wallet, Status, Coinbase Wallet (or something similar) and get the same options, except if you press the Trust Wallet button it connects regardless of the dapp browser you use.

How about if instead of just showing the Trust Wallet button regardless, you detect which browser you are using (for this example, Safari, Trust Wallet, Status) and change the button accordingly:

1. Using Safari - Don't need to show Trust Wallet button

2. Using Trust Wallet - detect and customise button

3. Using Status - detect and customise button

4. Using other (e.g Coinbase Wallet) - not officially supported so default button

Steps to reproduce

Temporarily test it on http://boiling-caverns-82152.herokuapp.com/

[jinchung]

@ricburton

[jackjdleslie]

Addressed in #414