Consolidates ConversionService and ConverterRegistry interfaces;
implemented by GenericConversionService.
ConfigurablePropertyResolver#getConversionService now returns this
new type (hence so too does
ConfigurableEnvironment#getConversionService). This allows for
convenient addition / removal of Converter instances from Environment's
existing ConversionService. For example:
ConfigurableApplicationContext ctx = new ...
ConfigurableEnvironment env = ctx.getEnvironment();
env.getConversionService().addConverter(new FooConverter());
Issue: SPR-8389
git-svn-id: https://src.springframework.org/svn/spring-framework/trunk@4406 50f2f4bb-b051-0410-bef5-90022cba6387