Improve intellisense plugin

[lL1l1]

Description of the proposed changes

Use the text replacement functionality of the intellisense plugin for the following:

• Fix the syntax errors caused by {&n &n} by replacing it with {}
• Implement intellisense for hook files by prepending the hooked file to the hooking file.

Separately:

• Add comments for the old plugin changes (replacing # with --)

Testing done on the proposed changes

Use the test commit to try the changes.

Ctrl shift U to open the output log
switch output to Lua
Find log file
Open log file directory
There should be a diff.lua file, which lets you see what intellisense sees as you edit

Additional context

Another idea would be to automatically add function overloads for Class calls because currently they don't propagate types properly.

A lot of features on the language server's wiki don't work because we are 2-3 years out of date, such as generics. I tried the up to date version and it was enjoyable but clearly was missing features we need to work with fa.

Checklist

• Changes are annotated, including comments where useful
• Changes are documented in the changelog for the next game version