unifies approaches to call analysis in TreeInfo

Instead of a flurry of methods such as `methPart` or `typeArguments`
to analyze applications, there is a single access point to related info:

  `treeInfo.dissectApplied(tree)`

Dissection returns an instance of the `Applied` class, which can
extract parts of applications and perform other application-specific
operations, e.g. `applyCount`.

For the sake of convenience, there's also an extractor named `Applied`,
which extracts `core`, `targs` and `argss`, where core is everything
except targs and argss. Extractor works for both `Tree` and `Applied`
(in the former case, it's equivalent to first dissecting and pattern
matching).

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