expose BeatmapExt methods for mode-specific objects (#20)

* expose osu hitobjects

* added pub method to create osu objects

* expose mania objects

* added some derived traits to public types

* expose taiko objects

* expose catch objects

* add documentation

* fix documentation

src/mania/mania_object.rs

@@ -22,10 +22,15 @@ impl<'a> ObjectParameters<'a> {
     }
 }
 
-pub(crate) struct ManiaObject {
-    pub(crate) start_time: f64,
-    pub(crate) end_time: f64,
-    pub(crate) column: usize,
+/// A [`HitObject`] that was processed for the osu!mania gamemode.
+#[derive(Clone, Debug, PartialEq)]
+pub struct ManiaObject {
+    /// Start time of the object.
+    pub start_time: f64,
+    /// Endtime of the object.
+    pub end_time: f64,
+    /// Column of the object.
+    pub column: usize,
 }
 
 impl ManiaObject {

src/mania/mod.rs

@@ -9,13 +9,12 @@ use std::borrow::Cow;
 
 use crate::{beatmap::BeatmapHitWindows, util::FloatExt, Beatmap, GameMode, Mods, OsuStars};
 
-pub use self::{gradual_difficulty::*, gradual_performance::*, pp::*};
+pub use self::{gradual_difficulty::*, gradual_performance::*, mania_object::ManiaObject, pp::*};
 
-pub(crate) use self::mania_object::ManiaObject;
+pub(crate) use self::mania_object::ObjectParameters;
 
 use self::{
     difficulty_object::ManiaDifficultyObject,
-    mania_object::ObjectParameters,
     skills::{Skill, Strain},
 };