Remove dataformat-auto-detection functionality

[cowtowncoder]

One of more ambitious features of Jackson 1.x and 2.x has been ability to auto-detect format for a given input stream. It worked nicely for first 2 formats (json, smile), and has been extended for couple more; but has been proven difficult to support for many other formats (due to arguably design flaws on many binary formats; lack of signature or magic cookie).

Although incomplete support across all formats is not itself a fatal flaw (feature could be just used between formats where it is useful), there is non-trivial cost for maintaining support and implementations. But perhaps most importantly, it also imposes some complexity in the way ObjectMappers / ObjectReaders are used; and unless removed, prevents #1 (or requires significant new development to find a work-around).

For this reason, this feature will be remove from Jackson 3.0.