Snapshot file model, Hotspot restart on config change.

src/Pedalboard.hpp

@@ -101,6 +101,7 @@ public:
     PropertyMap patchProperties;
 public:
     ControlValue*GetControlValue(const std::string&symbol);
+    const ControlValue*GetControlValue(const std::string&symbol) const;
 
     bool IsStructurallyIdentical(const PedalboardItem&other) const;
 
@@ -166,7 +167,7 @@ class Snapshot {
 public:
     std::string name_;
     std::string color_;
-    bool isModified_ = true;
+    bool isModified_ = false;
     std::vector<SnapshotValue> values_;
 
     DECLARE_JSON_MAP(Snapshot);
@@ -186,10 +187,13 @@ class Pedalboard {
     int64_t selectedSnapshot_ = -1;
 
 public:
+    // deep copy, breaking shared pointers.
+    Pedalboard DeepCopy(); 
     static constexpr int64_t INPUT_VOLUME_ID = -2; // synthetic PedalboardItem for input volume.
     static constexpr int64_t OUTPUT_VOLUME_ID = -3; // synthetic PedalboardItem for output volume.
     bool SetControlValue(int64_t pedalItemId, const std::string &symbol, float value);
     bool SetItemEnabled(int64_t pedalItemId, bool enabled);
+    void  SetCurrentSnapshotModified(bool modified);
 
     bool IsStructureIdentical(const Pedalboard &other) const; // caan we just send a snapshot-style uddate instead of reloading plugins? All settings are ignored.
     Snapshot MakeSnapshotFromCurrentSettings(const Pedalboard &previousPedalboard);