[merlin] Handle filenames with dot-separated sections #4264
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This is part of #4217
Fixes ocaml/merlin#1262
It implements the proposed solution n° 2 to handle more gracefully source files with uncommon names.
For example it is somehow regular to have a file
my_module.ccpo.ml
that will be be preprocessed by a rule with targetmy_module.ml
.However the user-edited file is
my_module.ccpo.ml
and we want Merlin to work as expected even if the configuration has been generated by Dune formy_module.ml
.This PR implement the simplest solution to that issue: by convention, the first component of a filename whose parts are separated by dots is used to match with the generated configurations.