X11UI Reported to Not Work

[mfisher31]

These should eventually be split into separate issues.

Support

• Support Gtk2 UIs
• Support Gtk3 UIs
• Support Qt UIs (via Gtk wrapper in Suil)
• Support Native Cocoa UIs
• Support Native X11 UIs
• Support Native Windows UIs
• Support Show Interface

Nice-to-have

• Provide a direct method to display via UI show (current version returns a juce component with a toggle button to toggle show/hide)

Bugs

• Fix Initial Sizing Issues with Gtk2 Wrapped Qt5 GUIs