v2.1 finalised

[JSKitty]

Abstract

This PR bumps My PIVX Wallet to v2.1, as well as updating the changelog according to v2.1's unique upgrades.

A tiny changelog render feature was also added that highlights 'feature titles' in bold purple, making it easier to find and read each new feature separately.

The final commit of the initial PR also runs npm audit fix, resolving a couple easily fixable packages.

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Testing

To test this PR, it's suggested to attempt these user flows, or variations of these:

• Test Imports and New Wallet generations.
• Test that Syncing works as expected, without errors.
• Test Sending and Receiving both Transparent and SHIELD PIV.
• Test Contacts.
• Test Creating and Redeeming PIVX Promos.
• Test Staking and Unstaking.
• Any other small, quick tests you feel like doing... do them!

If any errors are found, the PR works unexpectedly, or you have viable suggestions to improve the UX or functionality of the PR, let me know!

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[JSKitty]

Very minor package-lock.json conflict resolved in 640dcf0 after merging #487

[JSKitty]

LGTM LFG, Godspeed!