CLANG support

[roelj]

I see @su-v has made the code compatible with CLANG. As far as I can see it doesn't conflict with the recent changes. Could you (@su-v) send a pull request so I can easily merge your changes into here?

[su-v]

Hi!

Could you (…) send a pull request so I can easily merge your changes into here?

Yes, of course - I do have caveats though:

• not tested with clang from latest Xcode on Mavericks (based on LLVM 3.4svn) which is much stricter than older clang releases from Apple. (I'm still on Lion; and I don't code C/C++ myself)
• Since I'm quite new to actively using git and github myself (first repo here, as you might have noticed), and first fork/PR, I'm likely to mess things up ;-) (for example: I didn't use a separate branch, instead committed to master directly; and I didn't fetch latest upstream changes either (and rebase after that)). Can you use it in its current state nevertheless?

[roelj]

I think that's fine. As far as I can see merging will go smoothly, even if it's behind the current commit. It's definitely useful! :)

[su-v]

Here's a screenshot on OS X Lion with sample WPI file in inklingreader (in the background) and the exported SVG file opened in Inkscape: https://www.dropbox.com/s/56n6n2ef5qwz5mu/inklingreader-osx-1.png

[roelj]

After merging I produced the same with CLANG on Debian 7.4 (including the compiler warning). Thanks for the pull request and the screenshot.