Make command palettes real plugins

[TheJusticeMan]

Currently, command palettes are not implemented as real plugins, which limits their extensibility and maintainability. Refactor the command palette system so that palettes are first-class plugins, allowing for easier customization and integration with other features.

[TheJusticeMan]

Modularize the data types into separate plugins. The TSK would be one plugin. The bookmarks and history and main navigation would be another. The search will be another plugin.