Implement Initialize method in Editor class and override in derived editors

src/app/editor/music/music_editor.cc

@@ -1,15 +1,16 @@
 #include "music_editor.h"
 
-#include "imgui/imgui.h"
-
 #include "absl/strings/str_format.h"
 #include "app/editor/code/assembly_editor.h"
 #include "app/gui/icons.h"
 #include "app/gui/input.h"
+#include "imgui/imgui.h"
 
 namespace yaze {
 namespace editor {
 
+void MusicEditor::Initialize() {}
+
 absl::Status MusicEditor::Update() {
   if (ImGui::BeginTable("MusicEditorColumns", 2, music_editor_flags_,
                         ImVec2(0, 0))) {