Marshalling enhancements

Marshalling enhancements to reduce complexity and cost:

• Remove CacheMarshaller/GlobalMarshaller differentiation. (see ISPN-6905)
• Manually encode all known types within Infinispan. (see ISPN-6906)
• For potentially unknown types, e.g. keys, values, use JBoss Marshalling. (see ISPN-6906)
• Make dealing with unknown types and Strings pluggable so that other marshalling frameworks can more easily be plugged and we can try alternative ways to encode Strings.
• Avoid reentrancy of marshalling, e.g. marshall a command, then marshall a marshalled value...etc. With commands being encoded directly by us, no more need for reentrancy support. (see ISPN-6906)
• Avoid thread locals, e.g. those thread locals used to keep marshallers around. (see ISPN-6906)
• Get rid of VersionAwareMarshaller. (see ISPN-6905)
• Deprecate (then remove...) AdvancedCache.with(Classloader) method. (see ISPN-6905)