fix: hover for period qualifiers and single quotes in names

[Durbatuluk1701]

This PR modified the word_at_position function to allow for . and ' to appear in names.

This should fix #884

One note: It does allow for "words" to begin with a ., however it is just handled by providing no hover information since it would not be a legal name in Coq.

Closes #884

[rtetley]

@gares Do you think this could possibly create unwanted side effects ?

[gares]

I think that adding ' is a net win, I've seen quite some code naming stuff like foo'.

The . is a bit unclear to me. Nat.pl|us is today considered as plus, that is probably bad since it is more ambiguous than Nat.plus. At the same time Na|t.plus counts a Nat. I don't know if, in that case, if the user expects to get info on the module Nat or the addition. (I use | for the caret position)

[rtetley]

I think until we introduce some form of namespace it is a matter of deciding which is worse:

• Not getting hover information on Nat.pl|us
• Getting Nat.plus info on Na|t.plus

[gares]

I think we can merge, but I did not test it.

[Durbatuluk1701]

Pushed a rework that should handle cases like: lemma1_te|st sandbox.mylem|ma (also sand|box.mylemma will have the same results, still not sure if that is desired behavior) lem|ma' (fully matches lemma' and does not drop at single quotes)

[rtetley]

Awesome ! I'll test and merge tomorrow ! Thanks !

[rtetley]

We did some experimenting with @gares and were able to get a solution to the Module.foo problem, I'll merge as soon as CI goes green ! Thanks again !