Adding Tagline on Play Metadata struct

Adding the field Tagline to Play metadata to allow a TopShot NFT's description to be accessible on chain. Also make several Play Metadata fields optional to support the concept of Team Plays

What's Changed

• Feature/core nft views by @jrkhan in #161
• Removed dead code by @jrkhan in #166
• Add test abstraction to speed building tests by @jrkhan in #168
• Fix: typos by @omahs in #169
• Update CODEOWNERS to notify SC Eng by @franklywatson in #171
• Support Team Plays and Tagline in play metadata by @zihehuang in #175
• Add remix (#163) by @anatoly256 in #177

New Contributors

• @omahs made their first contribution in #169
• @franklywatson made their first contribution in #171
• @zihehuang made their first contribution in #175

Full Changelog: lib/go/templates/v1.1.1...lib/go/templates/v1.1.2