[refactor]: c++ implementation (#13)

implemented in c++ to improve readability and simplify maintenance

Co-authored-by: HiveBeats <e1lama@protonmail.com>
Reviewed-on: #13

inc/SynthGuiState.h

@@ -0,0 +1,16 @@
+#pragma once
+#include "OscillatorType.h"
+#include "raygui.h"
+#include <vector>
+
+struct OscillatorGuiState {
+    float volume;
+    float freq;//todo: remove or change to pitch shift
+    OscillatorType waveshape;
+    bool is_dropdown_open;
+    Rectangle shape_dropdown_rect;
+};
+
+struct SynthGuiState {
+    std::vector<OscillatorGuiState*> oscillators;
+};