Add "bring your own gui" example plugins

Cargo.toml

@@ -22,6 +22,9 @@ members = [
   "cargo_nih_plug",
   "xtask",
 
+  "plugins/examples/byo_gui_gl",
+  "plugins/examples/byo_gui_softbuffer",
+  "plugins/examples/byo_gui_wgpu",
   "plugins/examples/gain",
   "plugins/examples/gain_gui_egui",
   "plugins/examples/gain_gui_iced",

plugins/examples/byo_gui_gl/Cargo.toml

@@ -0,0 +1,22 @@
+[package]
+name = "byo_gui_gl"
+version = "0.1.0"
+edition = "2021"
+authors = ["Billy Messenger <60663878+BillyDM@users.noreply.github.com>"]
+license = "ISC"
+
+description = "A simple example plugin with a raw OpenGL context for rendering"
+
+[lib]
+# The `lib` artifact is needed for the standalone target
+crate-type = ["cdylib", "lib"]
+
+[dependencies]
+nih_plug = { path = "../../../", features = ["assert_process_allocs", "standalone"] }
+baseview = { git = "https://github.com/RustAudio/baseview.git", rev = "9a0b42c09d712777b2edb4c5e0cb6baf21e988f0", features = ["opengl"] }
+raw-window-handle = "0.5"
+glow = "0.16"
+crossbeam = "0.8"
+atomic_float = "0.1"
+# To make the state persistable
+serde = { version = "1.0", features = ["derive"] }