Windows build environment:

- Renamed folder build_libs to build-libs
- Removed old file stripSVN.sh
- Fixed some batch files
- Switch from curl to wget
- Added Qt environment
- Added build.bat to build everything

build_scripts/Windows/qt-cmd.bat

@@ -0,0 +1,27 @@
+:: Usage:
+:: call qt-cmd.bat <Qt version> [command]
+
+@echo off
+
+setlocal
+
+set QtVersion=%~1
+
+:: Initialize environment
+call "%~dp0env.bat"
+if errorlevel 1 goto error_env
+call "%EnvPath%\env-qt.bat" %QtVersion%
+if errorlevel 1 goto error_env
+
+if "%~2"=="" (
+	"%ComSpec%"
+) else (
+	"%ComSpec%" /c %2 %3 %4 %5 %6 %7 %8 %9
+)
+
+exit /B %ERRORLEVEL%
+
+:error_env
+echo Failed to initialize environment.
+endlocal
+exit /B 1