add support for SOCKS5 proxies

[Unpublished]

closes #893

I don't know how to easily update these hint coords, maybe someone can update them in a followup commit.

[trollixx]

Thanks for the contribution!

Unless I missed something, I don't see any differences between HTTP and SOCKS5 code branches. I think it'd be better to have just one user defined setting, that accepts both types of proxies. Updating the preference dialog with a "HTTP or SOCKS5" label should work just fine.

[trollixx]

I wonder if there are any valid setups when independent settings for HTTP and SOCKS5 proxies would be required..

[Unpublished]

Yeah that one was easy to oversee and I believe the only one.

AFAIK one can't setup up two proxies at the same time with qt so the only usecase I can think of would be a user who switches between http/socks proxy very often (for whatever reasons) and therefore wants them to be saved separately.

[trollixx]

It is possible with QNetworkProxyFactory. See a sample workflow here.

[Unpublished]

Sorry, I'm always getting seg faults when I try to use QNetworkProxyFactory::setApplicationProxyFactory, can you finish this PR as you would like it to be?

[trollixx]

I'd like to check if I can make QNetworkProxyFactory work, if not will just merge your change.

[trollixx]

This will go into 0.7 branch.

[grooveadelic]

How far off from a merge is this PR? I'm willing to give a hand in getting these feature merged, even if I'm not a C developer myself.

[trollixx]

I added SOCKS5 support in 4d019ff. It's pretty much similar to this PR, except that I implemented UI a bit differently. Regardless, thanks for the contribution!