Reorganize top-level directories with clearer naming convention

app -> app-desktop-macos, presets -> app-presets, server -> remote-server,
daw-config-reaper -> osc-config-daw, plugin-reaper-realearn -> plugin-reaper-relearn.
Updated run.py and presets.py path references accordingly.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

plugin-reaper-relearn/main/lib/helgoboss-learn/src/source/midi_source_script.rs

@@ -0,0 +1,22 @@
+use crate::{FeedbackValue, MidiSourceAddress, RawMidiEvents};
+use std::borrow::Cow;
+
+// The lifetime 'a is necessary in case we want to parameterize the lifetime
+// of the additional input dynamically. An alternative would have been to
+// require the additional input type to be static and take it by reference.
+// But that would be less generic.
+pub trait MidiSourceScript<'a> {
+    type AdditionalInput: Default;
+
+    /// Returns raw MIDI bytes.
+    fn execute(
+        &self,
+        input_value: FeedbackValue,
+        additional_input: Self::AdditionalInput,
+    ) -> Result<MidiSourceScriptOutcome, Cow<'static, str>>;
+}
+
+pub struct MidiSourceScriptOutcome {
+    pub address: Option<MidiSourceAddress>,
+    pub events: RawMidiEvents,
+}