build: CelesteTAS v3.43.4, Studio v3.8.1

- Fix: Free-camera interactions with center-camera
- Fix: Center camera zooming and rectangle selection not working as intended
- Fix: Collab lobbies not working with the SelectCampaign command
- Fix: Various issues related to save-states
- Fix: SelectCampaign command not accounting for variants menu item

CelesteTAS-EverestInterop/everest.yaml

@@ -1,5 +1,5 @@
 - Name: CelesteTAS
-  Version: 3.43.3
+  Version: 3.43.4
   DLL: bin/CelesteTAS-EverestInterop.dll
   Dependencies:
     - Name: EverestCore