Update gameplay feedback and repair portable VR launchers

SETUP.cmd

@@ -1,20 +1,34 @@
 @echo off
 setlocal
 cd /d "%~dp0"
-if exist ".venv\Scripts\python.exe" (
-    ".venv\Scripts\python.exe" tools\setup_environment.py %*
-    exit /b
-)
+if exist ".venv\Scripts\python.exe" goto environment
+if defined FTLVR_PYTHON goto configured_python
 where py >nul 2>nul
 if not errorlevel 1 (
-    py -3 tools\setup_environment.py %*
-    exit /b
-)
-where python >nul 2>nul
-if not errorlevel 1 (
-    python tools\setup_environment.py %*
-    exit /b
+    py -3 -u tools\setup_environment.py %*
+    goto result
 )
+for /f "delims=" %%P in ('where python 2^>nul') do if /i not "%%P"=="%LOCALAPPDATA%\Microsoft\WindowsApps\python.exe" if not defined FTLVR_PYTHON set "FTLVR_PYTHON=%%P"
+if defined FTLVR_PYTHON goto configured_python
 echo Python was not found. Install Python 3.10 or newer from python.org, including its launcher.
+echo The Microsoft Store alias is not a Python installation.
 echo See docs\INSTALLATION.md. No game files have been changed.
+call tools\show_launcher_error.cmd
 exit /b 1
+
+:environment
+".venv\Scripts\python.exe" -u tools\setup_environment.py %*
+goto result
+
+:configured_python
+if not exist "%FTLVR_PYTHON%" (
+    echo FTLVR_PYTHON does not point to a Python executable.
+    call tools\show_launcher_error.cmd
+    exit /b 1
+)
+"%FTLVR_PYTHON%" -u tools\setup_environment.py %*
+
+:result
+set "FTLVR_EXIT=%errorlevel%"
+if not "%FTLVR_EXIT%"=="0" call tools\show_launcher_error.cmd
+exit /b %FTLVR_EXIT%