Enhance undo impl2 (#63)

* Added license comment.

* Enhance undo/redo for path deformation and drawable editing.

* - remember and undo "isSet" flags for undo/redo of DeformationParameterBinding.
- Undo work well with path deformation across different keypoints.

source/creator/actions/drawable.d

@@ -0,0 +1,91 @@
+/*
+    Copyright © 2020,2022 Inochi2D Project
+    Distributed under the 2-Clause BSD License, see LICENSE file.
+*/
+module creator.actions.drawable;
+import creator.core.actionstack;
+import creator.actions;
+import creator;
+import inochi2d;
+import std.format;
+import i18n;
+
+/**
+    Action to add parameter to active puppet.
+*/
+class DrawableChangeAction : GroupAction, LazyBoundAction {
+private:
+    void copy(ref MeshData src, ref MeshData dst) {
+        dst.vertices = src.vertices.dup;
+        dst.uvs      = src.uvs.dup;
+        dst.indices  = src.indices.dup;
+        dst.origin   = src.origin;
+    }
+public:
+    Drawable self;
+    string name;
+
+    MeshData oldMesh;
+    MeshData newMesh;
+
+    this(string name, Drawable self) {
+        super();
+        this.name = name;
+        this.self = self;
+        copy(self.getMesh(), oldMesh);
+    }
+
+    override
+    void updateNewState() {
+        copy(self.getMesh(), newMesh);
+    }
+
+    void addBinding(Parameter param, ParameterBinding binding) {
+        addAction(new ParameterBindingRemoveAction(param, binding));
+    }
+
+    /**
+        Rollback
+    */
+    override
+    void rollback() {
+        self.rebuffer(oldMesh);
+        super.rollback();
+    }
+
+    /**
+        Redo
+    */
+    override
+    void redo() {
+        self.rebuffer(newMesh);
+        super.redo();
+    }
+
+    /**
+        Describe the action
+    */
+    override
+    string describe() {
+        return _("Changed drawable mesh of %s").format(self.name);
+    }
+
+    /**
+        Describe the action
+    */
+    override
+    string describeUndo() {
+        return _("Drawable %s was changed").format(self.name);
+    }
+
+    /**
+        Gets name of this action
+    */
+    override
+    string getName() {
+        return this.stringof;
+    }
+
+    override bool merge(Action other) { return false; }
+    override bool canMerge(Action other) { return false; }
+}