Ensure Assets editor remains docked in the main window
Remove some deprecated ImGui functions
Note: I tried upgrading to the latest imgui docking branch commit, which fixes a few bugs we're encountering... unfortunately it also added a couple more serious bugs. Will wait for the next imgui release before we try that again.
Note: I tried upgrading to the latest imgui docking branch commit, which fixes a few bugs we're encountering... unfortunately it also added a couple more serious bugs. Will wait for the next imgui release before we try that again.