* Removed ScriptingEngineBase::load(), inappropriate interface specification, only used by child classes and more properly defined by them
* Fixed inappropriate use of final
* Fixed case of a class constant to conform with MediaWiki conventions
* Use a factory function interface for module creation instead of a class name accessor
* Don't pass unnecessary $engine parameter to ScriptingFunctionBase::__construct(). Pass parent object as the first parameter per convention.
* Fixed unnecessary reference parameter in doRunHook()
* Have LuaSandboxEngineFunction::call() return the first result or null, per the base class documentation, instead of imploding.
* Use strval() to avoid a warning in case call() returns an array or object
* Improved some comments
* In importModule(), don't catch exceptions since that luasandbox bug is fixed now
* Use the chunkName parameter to loadString to get more informative error messages
