improve detection of multiline comments

[ezio416]

Since Angelscript supports multiline comments like:

/*
comment block
*/

There should be proper detection of them. While editing within the comment block it's unable to parse it, but as soon as I start editing some real code elsewhere in the file, the red squigly goes away

[ezio416]

seems to no longer be an issue, maybe I was running into an edge case but I can't reproduce it now

[ezio416]

Seems to happen when the comment is at the end of a file actually