Pretty up the code a little:

• Move architecture dependent defines (along with printf macros) to Architecture.h
• Printf macros are Unicode by default, use _S version for ASCII
• Get rid of TEXT for Unicode, use L instead
• Turn Logger, ConfigurationHolder, PluginLoader into normal classes (there are instances in global class Scylla)
• Rewrite Logger (no nasty pointers to MainGui, no need for newline)
• Misc fixes