brush settings reset button, hook crash handler on every thread, update changelog

src/node_panel_stroke.h

@@ -84,6 +84,8 @@ public:
     NodeSliderH* m_pattern_contrast;
     NodeSliderH* m_pattern_depth;
 
+    NodeButton* m_brush_settings_reset;
+
     std::shared_ptr<NodePanelBrush> m_brush_popup;
     std::shared_ptr<NodePanelBrush> m_pattern_popup;
     std::function<void(Node* target)> on_stroke_change;