Added Visual Studio and Delphi project file types to the XML lexer

[qcz]

Added the following file types to the XML lexer:

• csproj: Microsoft Visual Studio C# project file
• vbproj: Microsoft Visual Studio Visual Basic project file
• dproj: Embarcadero Delphi Project File

The content of these file types is standard XML.

[gfx]

Thanks. The PR should work as expected, but I wonder why the XML lexer can't guess the file type for them.

Maybe improving Rouge::Lexers::XML.analyze_text is better.

[pbregener]

Guessing works just fine without this PR for me.

All my Visual Studio 2015 C/C++/Fortran files (vcproj, vcxproj, vfproj) start with

<?xml version="1.0" encoding="UTF-8"?>
<Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">

[qcz]

It does not work for me in GitLab (9.5.1) for csproj files:

[pbregener]

Works for me in GitLab... 😕

[gfx]

Gessing should be improved after #763

[pbregener]

@gfx As mentioned, I cannot reproduce the problem anyways.

[jneen]

Since GitLab users are here - did you know you can manually override guessing with your .gitattributes file?

https://docs.gitlab.com/ce/user/project/highlighting.html

[qcz]

I've found the culprit: my csproj files have an UTF8 BOM at the start of the file (they are saved this way by default). If I remove them, GitLab successfully guesses the type of these files. As UTF8 BOM is a pretty common thing, it should not be a blocker of detecting the type of a file.

[pbregener]

Still, I don't think the approach of this PR is the right solution for that problem. Maybe you can file a new issue and close this PR @qcz?

[qcz]

Done. See #767.