Define WXINTL_NO_GETTEXT_MACRO.

This removes the need for CleanPreprocessor.h.
Add tracing preference menu.

This allows users to configure some tracing options from the trace viewer GUI,
specifically the thread event limit and archive limit. These values will be
overriden by the environment variables (SEEC_EVENT_LIMIT and SEEC_ARCHIVE_LIMIT,
respectively).

Also, correctly call seec::setupCommonConfig() before accessing the config in
the runtime library.