brings JavaMirrors up to speed with ClassfileParser

Apparently there are still discrepancies between how the vanilla compiler
turns class files into symbols and how the reflective compiler does it.

Working on bringing these guys in sync, one bug at a time.
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
Merge pull request #2761 from scalamacros/ticket/7510

Assorted toolbox fixes
Merge pull request #2767 from gourlaysama/t4907

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