Fix GNU source location presentation

[tothambrus11]

The common syntax for referring to lines and columns is to write line:column instead of line.column. When I make this change, the link will become clickable in VSCode.

[dabrahams]

I'd have used that syntax but it's not one of the ones documented as being usable for anything having a range of locations. Is that merely an oversight in the docs?

sourcefile:line1.column1-line2.column2: message
sourcefile:line1.column1-column2: message
sourcefile:line1-line2: message

Regardless, if VSCode doesn't support the format we are currently using, a change should be submitted to fix that.

[tothambrus11]

Sorry for the oversight, gcc indeed outputs the ranges like that. Now, I cannot seem to reproduce the problem neither with relative nor absolute paths, it's a bit weird...
So we can stick with the original format, but then the second part should be made consistent with the first: line.column-line.column instead of line.column-line:column

[dabrahams]

@tothambrus11 Languishing PRs are bad for the project. I think this could still be merged, but I can't make changes to your branch. Can you please merge main into this so testing will be re-triggered?

Also, it would be great if you could review the open PRs to see if you have any others like this.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.28%. Comparing base (f1b2d58) to head (91f6642).

Files with missing lines	Patch %	Lines
Sources/FrontEnd/SourceRange.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1515   +/-   ##
=======================================
  Coverage   88.28%   88.28%           
=======================================
  Files         381      381           
  Lines       22910    22910           
=======================================
+ Hits        20225    20227    +2     
+ Misses       2685     2683    -2     

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[tothambrus11]

@dabrahams good point, thanks for reminding! I closed the other PR because it has already become somewhat obsolete.