instance management flow

[microlith57]

• add
• list
• remove

---

• install everest
  • from version spec (stable, beta, dev, 1.xxxx.0, xxxx)
  • from build url / zip file
  • from pr # (invoking dotnet)
  • from source path
• update everest
  • partial install from source
• uninstall everest

---

• launch everest
• launch vanilla