Fix PlayerEvents not being reachable from root

Added unreachable_pub lint which should help to prevent this issue from
happening again.

Note: due to a compiler error, the root-level `metadata` re-exports had
to be split into 3; see
rust-lang/rust#64762

src/event.rs

@@ -113,7 +113,7 @@ pub struct PlayerEvents<'a> {
 }
 
 impl<'a> PlayerEvents<'a> {
-    pub fn new(player: &'a Player<'a>) -> Result<PlayerEvents<'a>, DBusError> {
+    pub(crate) fn new(player: &'a Player<'a>) -> Result<PlayerEvents<'a>, DBusError> {
         let progress = Progress::from_player(player)?;
         Ok(PlayerEvents {
             player,
@@ -123,6 +123,7 @@ impl<'a> PlayerEvents<'a> {
         })
     }
 
+    /// Current tracklist of the player. Will be kept up to date.
     pub fn track_list(&self) -> Option<&TrackList> {
         self.track_list.as_ref()
     }

src/lib.rs

@@ -5,6 +5,7 @@
     trivial_casts,
     trivial_numeric_casts,
     unsafe_code,
+    unreachable_pub,
     unstable_features,
     unused_import_braces,
     unused_qualifications
@@ -50,6 +51,8 @@ extern crate from_variants;
 extern crate dbus;
 
 mod extensions;
+
+#[allow(unreachable_pub)]
 mod generated;
 
 mod event;
@@ -60,9 +63,11 @@ mod pooled_connection;
 mod progress;
 mod track_list;
 
-pub use crate::event::{Event, EventError};
+pub use crate::event::{Event, EventError, PlayerEvents};
 pub use crate::find::{FindingError, PlayerFinder};
-pub use crate::metadata::{Metadata, Value as MetadataValue, ValueKind as MetadataValueKind};
+pub use crate::metadata::Metadata;
+pub use crate::metadata::ValueKind as MetadataValueKind;
+pub use crate::metadata::Value as MetadataValue;
 pub use crate::player::Player;
 pub use crate::progress::{Progress, ProgressError, ProgressTick, ProgressTracker};
 pub use crate::track_list::{TrackID, TrackList, TrackListError};

src/player.rs

@@ -21,7 +21,7 @@ pub(crate) const MPRIS2_PREFIX: &str = "org.mpris.MediaPlayer2.";
 pub(crate) const MPRIS2_PATH: &str = "/org/mpris/MediaPlayer2";
 
 /// When D-Bus connection is managed for you, use this timeout while communicating with a Player.
-pub const DEFAULT_TIMEOUT_MS: i32 = 500; // ms
+pub(crate) const DEFAULT_TIMEOUT_MS: i32 = 500; // ms
 
 /// A MPRIS-compatible player.
 ///