-Fixed derp with analyser.
Refactoring virus2, Part II - Viruses.
-Removed obsolete curing/resistance methods.
-Split base.dm into disease2.dm, effect.dm, helpers.dm.
-Removed functions already defined in parent classes.
-Replaced checks in Topic() with parent class ones.
-Removed two unused files (there are duplicates in unused folder anyway)
-Removed commented out lines, mostly pre-antibody curing code.
-Shuffled code around for better readability (like antibody list)
-Moved various devices and items defines to separate file.
