Fix encoding error, convert source text from ISO-8859-2 to UTF-8

Was unable to compile due to an "unmappable character" error, caused
by character encoding in source files. Converted to standard UTF-8 encoding with:

iconv --from-code=ISO-8859-2 --to-code=UTF-8 src/pfaeff/CBRenderer.java | sponge src/pfaeff/CBRenderer.java
iconv --from-code=ISO-8859-2 --to-code=UTF-8 src/pfaeff/FileTools.java | sponge src/pfaeff/FileTools.java
iconv --from-code=ISO-8859-2 --to-code=UTF-8 src/pfaeff/NBTFileIO.java | sponge src/pfaeff/NBTFileIO.java
iconv --from-code=ISO-8859-2 --to-code=UTF-8 src/pfaeff/NumberOnlyActionListener.java | sponge src/pfaeff/NumberOnlyActionListener.java
Use Java 6 compatible exception catching, instead of Java 7 '|' for multiple
Use Java 6 compatible try, instead of Java 7-only try-with-resources

http://docs.oracle.com/javase/tutorial/essential/exceptions/tryResourceClose.html
Use java.util.logger.Logging instead of internal logging package

Now can compile..
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