Fix default interpolator handling in keyframe gui and after loading (fixes #64)

src/main/java/com/replaymod/simplepathing/ReplayModSimplePathing.java

@@ -46,7 +46,7 @@ public class ReplayModSimplePathing {
 
     @SubscribeEvent
     public void postReplayOpen(ReplayOpenEvent.Post event) {
-        currentTimeline = new SPTimeline();
+        clearCurrentTimeline();
         guiPathing = new GuiPathing(core, this, event.getReplayHandler());
     }
 
@@ -85,11 +85,11 @@ public class ReplayModSimplePathing {
     public void setCurrentTimeline(SPTimeline newTimeline) {
         selectedPath = null;
         currentTimeline = newTimeline;
+        updateDefaultInterpolatorType();
     }
 
     public void clearCurrentTimeline() {
         setCurrentTimeline(new SPTimeline());
-        updateDefaultInterpolatorType();
     }
 
     public SPTimeline getCurrentTimeline() {

src/main/java/com/replaymod/simplepathing/SPTimeline.java

@@ -71,7 +71,7 @@ public class SPTimeline implements PathingRegistry {
 
     @Getter
     private EntityPositionTracker entityTracker;
-    private InterpolatorType defaultInterpolatorType = InterpolatorType.fromString("invalid string returns default");
+    private InterpolatorType defaultInterpolatorType;
 
     public SPTimeline() {
         this(createInitialTimeline());

src/main/java/com/replaymod/simplepathing/gui/GuiEditKeyframe.java

@@ -310,6 +310,7 @@ public abstract class GuiEditKeyframe<T extends GuiEditKeyframe<T>> extends Abst
                         dropdown.setSelected(type); // trigger the callback once to display settings panel
                     } else {
                         setSettingsPanel(InterpolatorType.DEFAULT);
+                        type = InterpolatorType.DEFAULT;
                     }
                     if (getInterpolatorTypeNoDefault(type).getInterpolatorClass().isInstance(interpolator)) {
                         //noinspection unchecked