Refactor: Anim, rename function to `ANIM_bone_in_visible_collection()`

Rename `ANIM_bonecoll_is_visible(armature, bone)` to
`ANIM_bone_in_visible_collection(armature, bone)`, as that reflects the
actual functionality.

No functional changes.

@@ -219,0 +224,4 @@
+/**
+ * Hide this bone collection.
+ *
+ * This marks the bone collection as 'hidden'. This also effectively hides its decendants,

@@ -219,0 +231,4 @@
+/**
+ * Show or hide this bone collection.
+ *
+ * Do not use this with a hard-coded `is_visible` parameter, but use one of the

@@ -716,0 +750,4 @@
+}
+
+/* Set/clear BONE_COLLECTION_ANCESTORS_VISIBLE on this bone collection and all its decendents. */
+static void ancestors_visible_update(bArmature *armature,

@@ -456,0 +464,4 @@
+  BoneCollection *bcoll_r0_child0 = ANIM_armature_bonecoll_new(&arm, "r0_child0", root0_index);
+  BoneCollection *bcoll_r0_child1 = ANIM_armature_bonecoll_new(&arm, "r0_child1", root0_index);
+  const int child0_index = armature_bonecoll_find_index(&arm, bcoll_r0_child0);
+  BoneCollection *bcoll_c1_child0 = ANIM_armature_bonecoll_new(&arm, "c1_child0", child0_index);

@@ -716,0 +749,4 @@
+  }
+}
+
+/* Set/clear BONE_COLLECTION_ANCESTORS_VISIBLE on this bone collection and all its decendents. */

@@ -267,0 +297,4 @@
+   *
+   * \return true when this collection and all its ancestors are visible.
+   *
+   * \see is_visisble

@@ -267,0 +299,4 @@
+   *
+   * \see is_visisble
+   */
+  bool is_visible_effectively() const;