Refactor IDS into IfcTester with less magic and less code

* String building code all deleted and replaced with more maintainable code
 * Obscure features like metaclasses deleted
 * Regular constructors used instead of factory create and parse methods
 * Use Python class naming convention
 * Use polymorphism more (e.g. asdict, init) for facet classes
 * No more boolean any/and as users may want to test everything and not fail early
 * Error state is stored instead of streamed to logger so it can be tested and more flexible formatting

src/ifctester/README.md

@@ -0,0 +1,3 @@
+# ifctester
+
+Author, test, and see reports from IDS audits on the command line, as a webapp, or as a library.