Unify encoding

[TheElan]

It would be nice to have a unified encoding in the projects on both file source level and compiled code level. Needs some research, here are some useful links:

https://stackoverflow.com/questions/2164804/from-compilation-to-runtime-how-does-java-string-encoding-really-work

https://illegalargumentexception.blogspot.com/2009/05/java-rough-guide-to-character-encoding.html

https://stackoverflow.com/questions/5258526/java-source-file-encoding-with-chinese-character