Windows build environment:

- Added build script
- Added build-installer script
- Added pack script
- Added gitlog script
- Use shadow build

build_scripts/Windows/tools/get-gcc-version.bat

@@ -0,0 +1,42 @@
+:: Usage:
+:: call get-gcc-version.bat variable
+
+setlocal
+
+set Var=%~1
+if "%Var%"=="" (
+	echo.
+	echo Parameter error.
+	exit /B 1
+)
+
+set GCCVersion=
+
+call "%~dp0find-in-path.bat" GCCPath gcc.exe
+if "%GCCPath%"=="" (
+	echo.
+	echo Cannot find gcc.exe in PATH.
+	goto exit
+)
+
+gcc --version >"%~dp0gccversion.tmp"
+for /F "tokens=1*" %%A in (%~sdp0gccversion.tmp) do (
+	if "%%A"=="gcc" (
+		call :find_version %%B
+		goto exit
+	)
+)
+
+:exit
+if exist "%~dp0gccversion.tmp" del /Q "%~dp0gccversion.tmp"
+
+endlocal & set %Var%=%GCCVersion%
+goto :EOF
+
+:find_version
+:loop
+if "%2" NEQ "" (
+	shift
+	goto loop
+)
+set GCCVersion=%1