Print warnings and errors on a single line

ExtendJ 8.0.1-17-gad3996f Java SE 8

ExtendJ prints warnings and errors in lists per file, like this:

Errors:
org/gjt/sp/jedit/bsh/NameSource.java:63,5:
  Syntactic Error: unexpected token "}"
Warnings:
org/gjt/sp/jedit/bsh/classpath/BshClassPath.java:593:
  WARNING: toURL() in java.io.File has been deprecated
org/gjt/sp/jedit/bsh/classpath/BshClassPath.java:665:
  WARNING: toURL() in java.io.File has been deprecated
org/gjt/sp/jedit/bsh/classpath/BshClassPath.java:757:
  WARNING: toURL() in java.io.File has been deprecated

I prefer having errors and warnings on a single line, meaning that the above messages would be printed like this:

org/gjt/sp/jedit/bsh/NameSource.java:63,5: error: unexpected token "}"
org/gjt/sp/jedit/bsh/classpath/BshClassPath.java:593: warning: toURL() in java.io.File has been deprecated
org/gjt/sp/jedit/bsh/classpath/BshClassPath.java:665: warning: toURL() in java.io.File has been deprecated
org/gjt/sp/jedit/bsh/classpath/BshClassPath.java:757: warning: toURL() in java.io.File has been deprecated

This would make ExtendJ output more similar to Javac output and should improve interoperability with Javac.

Another minor issue is that errors and warnings use different capitalization: errors have mixed lower/upper case while warnings are all upper case. This seems odd, we should just do it like javac does and print error/warning in lower case.

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