more doc string and reexport fixes

src/model/transport.rs

@@ -1,6 +1,7 @@
 use crate::core::*;
 
 #[derive(PartialEq)]
+/// Which section of the transport is focused
 pub enum TransportFocus { BPM, Quant, Sync }
 
 impl TransportFocus {
@@ -20,9 +21,10 @@ impl TransportFocus {
     }
 }
 
+/// Stored and displays time-related state.
 pub struct TransportToolbar {
+    /// Enable metronome?
     pub metronome: bool,
-    pub mode:      bool,
     pub focused:   bool,
     pub entered:   bool,
     pub selected:  TransportFocus,
@@ -48,7 +50,6 @@ impl TransportToolbar {
         Self {
             selected:  TransportFocus::BPM,
             metronome: false,
-            mode:      false,
             focused:   false,
             entered:   false,
             playhead:  0,