The template-header propagation only walked files with a module
declaration, so EU07.cpp, windows.cpp, export_e3d_standalone.cpp and
every betterRenderer source were outside it - including the file with
main(). They reach cParser and friends through eu07.simcore and
instantiate their templates without the headers those bodies name.
Adds audit_modules.py, which checks the whole tree for the seven classes
this migration hit; all seven are clean now.
