Beatmap Sections & Latency Reduction (#170)

* prep UI for chart section

* all special layers now on one area

todo: have buttons toggle between special layers  (selection mode shows all?), use the tabs system for this

* swapping between special timelines - prelim

* special entities can be placed

* spec. timeline base functions complete

music volume changes should work now

* attempt at input lag reduction

needs testing

* fix dsp issues

* smaller DSP buffer?

* Revert "smaller DSP buffer?"

This reverts commit 9d36db5ff9.

* make conductor clock use real time (double)

change order of execution of input-related scripts to further attempt a reduction in input latency

* start values can be changed

make the old special entity bar visible when the corresponding type is selected

* creation of Chart Sections (TODO: GO REFERENCE)

* added GO references

* section edit dialog

* disable wrapping on chart section obj

* backspace can now delete entities

* entities don't shift when duplicated

* fix PlayerActionEvent order of operations

- fixed remix loading trying to clear special timeline while it's writing to itself

* make oop check match parity

* more operation order fix

* fix Karate Man BG initialization

* show section progress in editor

todo: section progress in-game

* more fix for entity duping

Assets/Scripts/LevelEditor/Timeline/SpecialTmeline/Tabs/SpecialTimelineTempo.cs

@@ -0,0 +1,31 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using HeavenStudio.Editor.Track;
+
+namespace HeavenStudio.Editor
+{
+    public class SpecialTimelineTempo : TabsContent
+    {
+        // Start is called before the first frame update
+        void Start()
+        {
+
+        }
+
+        // Update is called once per frame
+        void Update()
+        {
+
+        }
+
+        public override void OnOpenTab()
+        {
+            SpecialTimeline.instance.FixObjectsVisibility();
+        }
+
+        public override void OnCloseTab()
+        {
+        }
+    }
+}