EPIC: Plugin Enhancements

[mattrunyon]

There are a number of plugin enhancements we want to make. When talking about plugins, this is the current terminology

• DashboardPlugin - Gets mounted to the dashboard. Doesn't necessarily need to display anything on its own unless it floats over the dashboard (Linker). Typically used to listen for widgets from the server and emit panel open events
• WidgetPlugin - Plugin that handles displaying a widget from the server. Right now tables, plots, data frames
• TablePlugin - A plugin to enhance a table widget. Mounted with the table
• CompositePlugin - A plugin that is really a collection of other plugin types to simplify packaging/authoring plugins. More of a "suite" of plugins bundled into 1 package
• AuthPlugin - A plugin to implement an authentication strategy

As of writing this ticket, we support DashboardPlugin, AuthPlugin, and TablePlugin.

• Allow dashboard plugins to advertise what type of objects they support #1167
• Add plugins to the console widget dropdowns (currently just DH tables and figures as separate buttons). Maybe use a combined dropdown
• Normalize and centralize plugin types and configs #1454
• Convert core DashboardPlugins to use new DashboardPlugin configs #1507
• Convert ConsolePlugin to use new dashboard plugin config #1545
• Add support for WidgetPlugins #1455
• Deprecate props (maybe not dashboardId) passed to plugins from DashboardLayout clone element call. Any props needed here like registerComponent could be in a context. This might help simplify the types around plugin panels (see here)
• Add golden layout event hub and global event hub to a context instead of passing through props (see here)
• Add support for plugin "suites" or composite plugins #1586
• Add lazy loading support. This would require the manifest to specify what widget types the plugin supports and probably a defer prop to indicate it should lazy load
• Add support for multiple TablePlugins on 1 table
• Add support for a "global" TablePlugin that is applied to tables automatically. These plugins would have a function to allow ignoring tables when they're created (so it could apply to all tables, but ignore tree tables)