Release 2.1.5
<type>[optional scope]: <Fix Singleton> [ * V3 does not invoke __init__ * Cleanup some English * Cleanup unused constant * Make module less dependent on codeallyXXX variants ] [https://github.com/hasii2011/ogl/issues/101]
<type>[optional scope]: <Fix Singleton> [ * V3 does not invoke __init__ * Cleanup some English * Cleanup unused constant * Make module less dependent on codeallyXXX variants ] [https://github.com/hasii2011/ogl/issues/101]