HackStudio: Map connections to langauge-servers by language name

HackStudio keeps a map that stores the different ServerConnection
instances we have open.

Previously, that map was indexed by a project's root path.
This did not make much sense because we only support opening a single
project with each instance of the HackStudio program.

We now index the different ServerConnections by the language name, which
allows us to support talking to multiple language-servers in the same
project (e.g C++ and Shell).

This also fixes an issue where if you first opened a Shell file, and
then a C++ file in the same project, then C++ language-server features
would not work.

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