SPDX License Identifiers are a more compact / standardized
way of representing file license information.
See: https://spdx.dev/resources/use/#identifiers
This was done with the `ambr` search and replace tool.
ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
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.
FileDB wraps the access to the contents of project files.
When asked to fetch a file, FileDB will either return its in-memory
model of the file if it has been "opened" by the language-server
protocol, or otherwise fetch it from the filesystem.
Previously, the cpp language server did not pledge "rpath" and got
access to the contents of files whenever they were opened by the
language client.
However, features like inspection of header files require the language
server to get the content of files that were not opened by the client.
The language server now pledges rpath but makes sure to only unveil
the project's directory and /usr/include.
