LF all the things

[dave-bartolomeo]

This change forces LF line endings for pretty much every text file in the repo. I added a few more directory-specific .gitattributes files for text files that need to have CRLF line endings, but everything else is LF now.

[ghost]

JavaScript changes 👍

[jbj]

@dave-bartolomeo for sanity checking, please compare this to #181, which does something very similar. The first thing I notice is that #181 removes CRs in extensionless files like cpp/config/suites/security/cwe-120 whereas this PR doesn't.

[dave-bartolomeo]

@jbj I was hoping to find a way to use .gitattributes to tell Git "If it looks like a text file, normalize it in the database, and always check out as LF". I wanted to do * text=auto eol=lf. The Git docs say that setting eol effectively sets text, so I thought this would force all files to be treated as text files (equivalent to * text eol=lf. However, I now find that according to https://github.com/git/git/blob/master/Documentation/RelNotes/2.10.0.txt#L248, * text=auto eol=lf should do what I want. I'll try that and make sure it doesn't accidentally normalize any binary files.

[dave-bartolomeo]

I've updated .gitattributes to just use * text=auto eol=lf, so all text files are now normalized.

[jbj]

As I understand that change note and various stackoverflow answers, * text=auto eol=lf will do what we want on git >= 2.10 but will convert CRLF -> LF in binary files on git < 2.10. Ubuntu 16.04 has git 2.7. Maybe that's okay as long as we have no binary files in the repo. When we do, code review can catch accidental modifications to binary files.

[dave-bartolomeo]

Anybody from @Semmle/cs and @Semmle/java want to take a quick look?

[dave-bartolomeo]

This is going to conflict with just about every change to this repo. I'm going to approve it myself as soon as the tests come back green, to avoid having to rebase over and over.

[aschackmull]

Looks like the java changes just hit example files for qhelp, so that LGTM.

[jbj]

I'll merge this before we get further conflicts. I assume @Semmle/cs would have commented by now if they had concerns.