Reorganisation of intropattern code

- emphasizing the different kinds of patterns
- factorizing code of the non-naming intro-patterns

Still some questions:

- Should -> and <- apply to hypotheses or not (currently they apply to
  hypotheses either when used in assert-style tactics or apply in, or
  when the term to rewrite is a variable, in which case "subst" is
  applied)?
- Should "subst" be used when the -> or <- rewrites an equation x=t
  posed by "assert" (i.e. rewrite everywhere and clearing x and hyp)?
- Should -> and <- be applicable in non assert-style if the lemma has
  quantifications?

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