"view problem" indexing & version comments

[Ste1io]

A few minor info problem related bugs, all closely related - if you'd like me to split this into separate issues, let me know.

• Version comment syntax for Visual Studio 2017 (# Visual Studio 15) not recognized as valid version comment line.
• Indexing for the "version comment" info problem is off by -2 if an empty first line problem is also present (showing only a single blue squiggly on line 1), and -1 if there is no empty first line (showing it under the word "Microsoft" above the actual version comment).
• Indexing for Info & Warning "View problem" links (when hovering the squiggly) doesn't factor in offset changes for that problem index when grouped by problem type; clicking it jumps you to an error at that index, ignoring the fact that errors are grouped before warnings and info problems. Jumping to the line from the "Problems" panel works as expected.