Glissando

Thank you very much for your patience folks. I've been recovering from a medical procedure which meant I hadn't been very able to work on these two fairly major issues until now. I'm still on the mend, but nevertheless relieved to be able to provide these fixes and get your glissandoes glissando-ing again!

🐛 Fixes

• #2: Clients should once again be allowed to join dedicated servers with Glissando installed on both sides.
• #3: Notes should no longer fail to stay selected after leaving the note block GUI.