Additional functionality in the testrunner.bat script.

The following changes are included in this script:
 1. Adds PRE_CLASSPATH var so that script callers can prepend .jar files to the classpath if they need to.
 2. Improved determination of java.exe location.
 3. Improved SOAPUI_HOME var determination.
 4. Added :ERROR function with 10 second pause timer.
 5. Sets window title and improved script output, showing variable values that the script determines.
 6. Uses new Maven params to set jar name when built
 7. Forces running in SOAPUI_HOME\bin directory but script can be altered to allow running in a different directory if necessary.