Remove duplicate and outdated Doxyfiles. One is enough. Remove the readme_doxygen.txt also, as doc generation instructions are already in the README.md.
tundra.Doxyfile: exclude all possible /deps dir variants.
NOT TO TUNDRA CORE - meshmoon.Doxyfile: exclude all deps and CMakeFiles dir variants.
Scene: add bool temporary parameter to CreateEntity and CreateLocalEntity, false by default.
Case-insensitive handling of attribute names. Tested by running the usual Meshmoon av and cam applications, no regressions encountered.