feat(params): add parameters, macros, RAVE controls and resources

Source/RAVEButton.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <JuceHeader.h>
+#include "Params.h"
+
+namespace serum
+{
+
+// ===========================================================================
+// RAVE — one-shot "make it huge" control. Toggling on snapshots the current
+// values of the affected parameters and pushes unison, width, drive, OTT and
+// reverb to their boosted settings; toggling off restores the snapshot.
+// ===========================================================================
+class RaveController
+{
+public:
+    void setEnabled (bool enabled, juce::AudioProcessorValueTreeState& apvts);
+    bool isEnabled() const noexcept { return enabled; }
+    void resetSnapshot();
+
+private:
+    bool enabled = false;
+    std::vector<std::pair<juce::String, float>> snapshot;
+
+    void snapshotParam (const juce::String& id, juce::AudioProcessorValueTreeState& apvts);
+    void setParam (const juce::String& id, float value, juce::AudioProcessorValueTreeState& apvts);
+};
+
+} // namespace serum