add escape sequences, fix VISIBLE

- VISIBLE doesn't print new line
- add lolcode escape sequences :) :> etc.
add string length accessor

- string length could be retrieved by taking its 'length' element
brainfuck .lol and string replace fix
add lots of compilation settings

- add output dir selector
- add target classpath selector
- add option to pack result into jar
- add option to set main class for jar