SI-4907 SI-4615 scala.bat honors -J and -D options.

This makes scala.bat parse and use -J and -D arguments.

Specifically:
 - Parameters starting with -J are stripped of the prefix, unquoted if
   necessary and appended to %JAVA_OPTS% or default values.
 - Parameters starting with -D are unquoted if necessary and then
   appended to the others. The right-hand side of a property can be
   quoted or not.
 - All of those are given to `java` before any other parameters.
 - The above only happens on parameter preceding the first parameter
   that does not start with "-" (usually a class name).
 - The exact arguments passed to scala.bat are also given as-is to
   the scala launcher (including -J and -D arguments).

   set JAVA_OPTS=-Xmx512m
   scala -J-Xmx128m -Dprop1=42 -Dprop2="hello world" "-Dprop3=bar"
"-J-Xms64m" Test foo

   will result in

   java -Xmx512m -Xmx128m -Dprop1=42 -Dprop2="hello world" -Dprop3=bar
-Xms64m [cp, scala main] -J-Xmx128m -Dprop1=42 -Dprop2="hello world"
"-Dprop3=bar" "-J-Xms64m" Test foo

src/compiler/scala/tools/ant/templates/tool-windows.tmpl

@@ -22,13 +22,74 @@ if "%~1"=="-toolcp" (
 	goto another_param
 )
 
-set _LINE_PARAMS=%1
+rem We keep in _JAVA_PARAMS all -J-prefixed and -D-prefixed arguments
+set _JAVA_PARAMS=
+
+if [%1]==[] goto param_afterloop
+set _TEST_PARAM=%~1
+if not "%_TEST_PARAM:~0,1%"=="-" goto param_afterloop
+
+rem ignore -e "scala code"
+if "%_TEST_PARAM:~0,2%"=="-e" (
+  shift
+  shift
+  if [%1]==[] goto param_afterloop
+)
+
+set _TEST_PARAM=%~1
+if "%_TEST_PARAM:~0,2%"=="-J" (
+  set _JAVA_PARAMS=%_TEST_PARAM:~2%
+)
+
+if "%_TEST_PARAM:~0,2%"=="-D" (
+  rem test if this was double-quoted property "-Dprop=42"
+  for /F "delims== tokens=1-2" %%G in ("%_TEST_PARAM%") DO (
+    if not "%%G" == "%_TEST_PARAM%" (
+      rem double quoted: "-Dprop=42" -> -Dprop="42"
+      set _JAVA_PARAMS=%%G="%%H"
+    ) else if [%2] neq [] (
+      rem it was a normal property: -Dprop=42 or -Drop="42"
+      set _JAVA_PARAMS=%_TEST_PARAM%=%2
+      shift
+    )
+  )
+)
+
 :param_loop
 shift
+
 if [%1]==[] goto param_afterloop
-set _LINE_PARAMS=%_LINE_PARAMS% %1
+set _TEST_PARAM=%~1
+if not "%_TEST_PARAM:~0,1%"=="-" goto param_afterloop 
+
+rem ignore -e "scala code"
+if "%_TEST_PARAM:~0,2%"=="-e" (
+  shift
+  shift
+  if [%1]==[] goto param_afterloop
+)
+
+set _TEST_PARAM=%~1
+if "%_TEST_PARAM:~0,2%"=="-J" (
+  set _JAVA_PARAMS=%_JAVA_PARAMS% %_TEST_PARAM:~2%
+)
+
+if "%_TEST_PARAM:~0,2%"=="-D" (
+  rem test if this was double-quoted property "-Dprop=42"
+  for /F "delims== tokens=1-2" %%G in ("%_TEST_PARAM%") DO (
+    if not "%%G" == "%_TEST_PARAM%" (
+      rem double quoted: "-Dprop=42" -> -Dprop="42"
+      set _JAVA_PARAMS=%_JAVA_PARAMS% %%G="%%H"
+    ) else if [%2] neq [] (
+      rem it was a normal property: -Dprop=42 or -Drop="42"
+      set _JAVA_PARAMS=%_JAVA_PARAMS% %_TEST_PARAM%=%2
+      shift
+    )
+  )
+)
 goto param_loop
 :param_afterloop
+
 if "%OS%" NEQ "Windows_NT" (
   echo "Warning, your version of Windows is not supported.  Attempting to start scala anyway."
 )
@@ -51,6 +112,9 @@ rem We use the value of the JAVA_OPTS environment variable if defined
 set _JAVA_OPTS=%JAVA_OPTS%
 if not defined _JAVA_OPTS set _JAVA_OPTS=@javaflags@
 
+rem We append _JAVA_PARAMS java arguments to JAVA_OPTS if necessary
+if defined _JAVA_PARAMS set _JAVA_OPTS=%_JAVA_OPTS% %_JAVA_PARAMS%
+
 set _TOOL_CLASSPATH=@classpath@
 if "%_TOOL_CLASSPATH%"=="" (
   for %%f in ("!_SCALA_HOME!\lib\*") do call :add_cpath "%%f"