Added icons for .pm similar to .pl

[cab-1729]

Perl modules end with the .pm extension. These are files imported by Perl scripts as objects. Most file managers I know display the same icon for .pm and .pl files.

[ariasuni]

Hi, there is already a similar pull request open but its author seems not responsive.

Do you think you could take the types mentioned here into account, and add the relevant ones to your pull request?

[cab-1729]

I've added the same icon for pm, t, pod, and plx.

I think we should not concern ourselves with the fact that plx is used in legacy code, given that a large portion of programmers interacting with perl are dealing with legacy code.

t is just perl code used for testing.

You are right about pod being documentation, but Plain Old Documentation(syntax used by pod files) is a sort of markup language often used inside of perl scripts instead of separate files. The perl interpreter ignores what is written with this syntax (similar to comments), hence .pod files are technically valid perl code. So it might make sense for them to have the same icon. Besides that, there isn't really another good alternative I can think of.

With regard to .xs files. These files allow perl to interact with C/C++ subroutines. It isn't really perl code, but the syntax is sort of like a combination of C and Perl. So I didn't give it the same icon. I think it is better to ignore xs files for now, because I couldn't find an icon that seems appropriate for those files.

[ariasuni]

OK, thanks a lot!