Resolves #272. Updates the windows launch script to perform conditional

launching based on the JRE version 8 or 9.

scripts/run_sdrtrunk_windows.bat

@@ -1 +1,25 @@
-java -XX:+UseG1GC -cp "SDRTrunk.jar;*;libs/*;config/*;images/*" gui.SDRTrunk
+@echo off
+
+java -version
+
+SETLOCAL ENABLEDELAYEDEXPANSION
+
+for /f "usebackq tokens=3" %%a in (`java -version 2^>^&1 ^| find "version"`) do ( 
+	rem set b to the unquoted version string parsed from the java version command
+	set b=%%~a
+
+	rem set c to the first character of the unquoted version string
+	set c=!b:~0,1!
+
+	if !c! equ 9 (
+		echo Using Java 9 options		
+		java -cp "SDRTrunk.jar;*;libs/*;config/*;images/*" --add-modules java.xml.bind gui.SDRTrunk
+	) else (
+		echo Using Java 8 options		
+		java -XX:+UseG1GC -cp "SDRTrunk.jar;*;libs/*;config/*;images/*" gui.SDRTrunk
+	)
+)
+
+ENDLOCAL
+
+@echo on