Add staging or beta testing support to plugin io console and plugin manager

[Velara]

Add option for user to select version of plugin in Plugin Manager

Add option to select plugin version in Plugin Manager (including any beta versions). Use Case: Cynthia is a beta tester for software company that makes numerous XD plugins. Her job is test new versions and log any bugs. Today a new version has come out. She goes through each feature meticulously testing each one. It is about lunch time when she finds a bug. She had important lunch plans and it looks like she will have to cancel but she remembers versioning was just added to the Plugin Manager…