30063 -----
10413 clean up unused code in Scanner and Parser
https://pharo.fogbugz.com/f/cases/1041
10414 Clean up preference Compiler warning (will come back later)
https://pharo.fogbugz.com/f/cases/10414
10417 Some more Compiler related cleanUps
https://pharo.fogbugz.com/f/cases/10417
Diff information:
http://smalltalkhub.com/#!/~Pharo/Pharo30/diff/Traits-MarcusDenker.470
http://smalltalkhub.com/#!/~Pharo/Pharo30/diff/Kernel-MarcusDenker.1378
http://smalltalkhub.com/#!/~Pharo/Pharo30/diff/Settings-Compiler-MarcusDenker.12
http://smalltalkhub.com/#!/~Pharo/Pharo30/diff/CompilerTests-MarcusDenker.137
http://smalltalkhub.com/#!/~Pharo/Pharo30/diff/Compiler-MarcusDenker.396
