ocaml: prepare for filetype separation, drop ols support #3732
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The ocaml filetype is currently used for several, different file
formats. This causes problems as not all tools support all formats.
New filetypes are introduced to support this separation, this needs some
changes in ale that are fortunately backwards-compatible.
These change add ocamlinterface file support for ocp-indent, merlin,
ocamlformat and ocaml-lsp. For ocaml-lsp I took the liberty to
add all recognised language ids, even if they are not supported.
ols has been removed as the project has been abandoned since 2019,
users are better served by other tools.
The PR for splitting the filetypes is at ocaml/vim-ocaml#61