Added Git Version number (Windows MSVS with prebuild script)

Author: m1geo

prebuild.cmd

@@ -0,0 +1,38 @@
+@echo off
+REM This pre-build file is for MSVS VC++. It parses the git master hash and
+REM converts it into GitVersion.h for compiling into builds. [George M1GEO]
+
+cd %1
+setlocal enabledelayedexpansion
+set HEADFILE=.git\HEAD
+set HASHFILE=0
+if exist %HEADFILE% (
+	for /F "tokens=4 delims=/:" %%a in ('type %HEADFILE%') do set HEADBRANCH=%%a	
+	set HASHFILE=.git\refs\heads\!HEADBRANCH!
+	echo Found Git HEAD file: %HEADFILE%   
+	echo Git HEAD branch: !HEADBRANCH!
+	echo Git HASH file: !HASHFILE!
+	call :USEHASH
+) else (
+	echo No head file :(
+	call :USENULL
+)
+
+goto :EOF
+
+:USENULL
+set GITHASH=0000000000000000000000000000000000000000
+goto :WRITEGITVERSIONHEADER
+
+:USEHASH
+for /f %%i in ('type !HASHFILE!') do set GITHASH=%%i
+goto :WRITEGITVERSIONHEADER
+
+:WRITEGITVERSIONHEADER
+echo # File contains Git commit ID SHA1 present at buildtime (prebuild.cmd) > GitVersion.h
+echo const char *gitversion = "%GITHASH%"; >> GitVersion.h
+echo Current Git HASH: %GITHASH%
+goto :FINISHED
+
+:FINISHED
+echo GitVersion.h written...