Show git revision on Blades of Exile title screen and in scenario editor

src/tools/gitrev.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+REVID=`/opt/local/bin/git rev-parse HEAD`;
+export FULLTAG=`/opt/local/bin/git tag --sort=v:refname | tail -n1`;
+TAGREV=`/opt/local/bin/git rev-parse $FULLTAG`;
+
+echo -e "\n#define GIT_REVISION \"${REVID:0:7}\"\n#define GIT_TAG \"$FULLTAG\"\n#define GIT_TAG_REVISION \"${TAGREV:0:7}\"\n" > tools/gitrev.hpp