Add LV2 plugins support

[SubhadeepJasu]

This pull request adds LV2 plugin support to Ensembles. In a different way of saying, Ensembles can now host LV2 plugins.

• [x] Detect plugins
• [x] Connect to plugins
• [x] Implement effect rack
• [ ] Implement instrument rack
• [ ] Implement Atom Support
• [ ] Implement External UI support