Merge branch '1.8.9' into 1.9.4

ed56673 Merge branch '1.8' into 1.8.9
91573d9 Update jGui, ReplayStudio and Translations
d71358b Add confirmation dialog before overwriting path presets (fixes #65)
1a55983 Move addCallback method from integration test Utils to main Utils
18c5bcd Be more cooperative with other mods on the ingame menu (fixes #42)
c054fe8 Register keys for simplepathing only once (fixes #63)
f13297c Fix default interpolator handling in keyframe gui and after loading (fixes #64)
391f304 Show error popup if entity tracker fails to load
0e0eaaa Fix entity tracker being set even if it failed loading (fixes #50)
a34bbbc Fix NPE when spectating a player without a camera entity
60879fb Change local class to be an inner class because Srg2Source breaks with it
dfafbec Load translations from github repo, only reload language not all resource packs
8a6ec51 Add missing tooltips to player overview and various missing chat messages
5677fc5 Re-add warning to replay editor
748a91e Fix missing tooltips on fav/like/dislike buttons in replay center
ee24866 Fix upload replay button not being updated when name/tags change
dba085c Move translations into separate repo
3f0e3e7 Fix NPE when receiving Replay|Restrict messages (fixes #16 GH)
40e1d85 Fix crash when saving the last keyframe in the edit gui (fixes #61)
03aada1 Update Mixin to 0.6.8 (fixes #9 GH)
0c1dc65 Fix interpolator being lost when moving keyframe to the end (fixes #62)
fcbbbc9 Add integration test. Run with ./gradlew runIntegrationTest
fe6ded0 Fix movement of keyframe via GuiEditKeyframe not updating selected keyframe
f58fa8f Fix Login GUI not respecting other GUIs opened on startup
4fc3a31 Fix OpenEye being installed into working dir instead of mcDataDir

src/main/java/com/replaymod/replay/ReplayHandler.java

@@ -209,6 +209,9 @@ public class ReplayHandler {
      */
     public void spectateEntity(Entity e) {
         CameraEntity cameraEntity = getCameraEntity();
+        if (cameraEntity == null) {
+            return; // Cannot spectate if we have no camera
+        }
         if (e == null || e == cameraEntity) {
             spectating = null;
             e = cameraEntity;