cleanup tracker class and move helper functions

src/app/editor/master_editor.cc

@@ -106,6 +106,7 @@ void MasterEditor::DrawFileDialog() {
       overworld_editor_.SetupROM(rom_);
       screen_editor_.SetupROM(rom_);
       palette_editor_.SetupROM(rom_);
+      music_editor_.SetupROM(rom_);
     }
     ImGuiFileDialog::Instance()->Close();
   }

src/app/editor/music_editor.cc

@@ -252,11 +252,13 @@ void MusicEditor::DrawToolset() {
   ImGui::Combo("#songs_in_game", &selected_option, kGameSongs, 30);
 
   gui::ItemLabel("Controls: ", gui::ItemLabelFlags::Left);
-  if (ImGui::BeginTable("SongToolset", 5, toolset_table_flags_, ImVec2(0, 0))) {
+  if (ImGui::BeginTable("SongToolset", 6, toolset_table_flags_, ImVec2(0, 0))) {
     ImGui::TableSetupColumn("#play");
     ImGui::TableSetupColumn("#rewind");
     ImGui::TableSetupColumn("#fastforward");
     ImGui::TableSetupColumn("#volume");
+    ImGui::TableSetupColumn("#debug");
+
     ImGui::TableSetupColumn("#slider");
 
     ImGui::TableNextColumn();
@@ -271,6 +273,9 @@ void MusicEditor::DrawToolset() {
     BUTTON_COLUMN(ICON_MD_FAST_REWIND)
     BUTTON_COLUMN(ICON_MD_FAST_FORWARD)
     BUTTON_COLUMN(ICON_MD_VOLUME_UP)
+    if (ImGui::Button(ICON_MD_ACCESS_TIME)) {
+      music_tracker_.LoadSongs(rom_);
+    }
     ImGui::TableNextColumn();
     ImGui::SliderInt("Volume", &current_volume, 0, 100);
     ImGui::EndTable();

src/app/editor/music_editor.h

@@ -6,6 +6,8 @@
 
 #include "absl/strings/str_format.h"
 #include "app/editor/assembly_editor.h"
+#include "app/rom.h"
+#include "app/zelda3/tracker.h"
 #include "gui/canvas.h"
 #include "gui/icons.h"
 #include "gui/input.h"
@@ -55,6 +57,7 @@ static constexpr absl::string_view kSongNotes[] = {
 class MusicEditor {
  public:
   void Update();
+  void SetupROM(ROM& rom) { rom_ = rom; }
 
  private:
   void DrawChannels();
@@ -63,6 +66,9 @@ class MusicEditor {
   void DrawSongToolset();
   void DrawToolset();
 
+  zelda3::Tracker music_tracker_;
+  ROM rom_;
+
   Mix_Music* current_song_ = NULL;
 
   AssemblyEditor assembly_editor_;