Add formatting, linting, and testing to CI checks (#44)

This PR adds `cargo fmt -- --check`, `nx lint ...` and `nx test ...` as
GitHub Actions. This will cause future PRs to automatically fail when
formatting issues, Clippy warnings, or test failures are present in the
changed code.

studio/src/anim/retargeting.rs

@@ -232,7 +232,7 @@ pub struct RetargetMap {
 }
 
 impl RetargetMap {
-    const MOCAP_NET: [(&str, &str); 80] = [
+    const MOCAP_NET: [(&'static str, &'static str); 80] = [
         // Spine
         ("LowerBack", "DEF-spine"),
         ("hip", "DEF-spine"),
@@ -333,7 +333,7 @@ impl RetargetMap {
         ("LHipJoint", "DEF-pelvis.L"),
     ];
 
-    const MIXAMO: [(&str, &str); 60] = [
+    const MIXAMO: [(&'static str, &'static str); 60] = [
         // Spine
         ("mixamorig:Hips", "DEF-spine"),
         ("mixamorig:Spine", "DEF-spine.001"),

studio/src/lib.rs

@@ -16,7 +16,7 @@ mod hierarchy;
 mod input;
 mod inspector;
 mod interaction;
-mod math;
+pub mod math;
 mod mixamo;
 mod persistance;
 mod scene;

studio/src/math/interp/traits.rs

@@ -19,7 +19,7 @@ pub trait InvLerp<T: Sized> {
     /// # Examples
     ///
     /// ```
-    /// use math::NearlyEq;
+    /// use studio::math::{NearlyEq, InvLerp};
     ///
     /// let t = 48_f32.inv_lerp(32., 64.);
     /// // The expected result is 0.5, because 48 is halfway between 32 and 64.
@@ -38,7 +38,7 @@ where
     /// # Examples
     ///
     /// ```
-    /// use math::NearlyEq;
+    /// use studio::math::{NearlyEq, Remap};
     ///
     /// let x = 48_f32.remap((32., 64.), (32., 128.));
     /// // The expected result is 80, because 48 is halfway between 32 and 64,
@@ -56,7 +56,7 @@ pub trait CurveSin {
     ///
     /// # Example
     ///
-    /// ```
+    /// ```ignore
     /// // This is fine, but it will feel "jerky" because the velocity is
     /// // constant from start to end.
     /// fn update_position(dt: f32, start: Vec3, end: Vec3, t: f32) -> Vec3 {