Combined the Agents in the repo

Agent-Windows/Install/preuninstall_agent.bat

@@ -0,0 +1,13 @@
+@echo off
+set WD=%~dp0
+pushd %WD%
+net session >nul 2>&1
+if NOT %errorLevel% == 0 (
+	echo Failure: Current permissions inadequate.
+	echo[
+	echo Run this script by using "Run as administrator" in the context menu.
+	pause >nul
+	exit
+)
+net stop ogp_agent
+sc delete ogp_agent