0.5.0 prep

[melissalinkert]

Required:

• #134
• #135
• #113 (likely covered by #134)
• #141

Optional:

• #126
• #132
• #136
• #137

[melissalinkert]

Closing in favor of https://github.com/orgs/glencoesoftware/projects/11 (see Projects tab above).