Remove path mapping options marked as deprecated for removal

[rstoyanchev]

This includes:

• suffixPatternMatch, registeredSuffixPatternMatch for annotated controller methods and configured through MVC Java config and XML namespace.
• trailingSlashMatch for extensions of AbstractHandlerMapping.
• favorPathExtension and ignoreUnknownPathExtensions and underlying PathExtensionContentNegotiationStrategy and ServletPathExtensionContentNegotiationStrategy for content negotiation, configurable through ContentNegotiationManagerFactoryBean and in the MVC Java config.
• matchOptionalTrailingSeparator in PathPatternParser.

[ukpagrace]

Hi @rstoyanchev if you are not working on this can I pick it up?

[bclozel]

@ukpagrace the issue is already assigned, thanks for reaching out!

[ukpagrace]

Oh no problem, thought he was one of the maintainers.

[bclozel]

@ukpagrace He is, it's just that we prefer community contributions on unassigned issues and especially on "ideal-for-contribution" issues.

[ukpagrace]

This is noted, thank you