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Pythons urllib supports proxys via env vars `http_proxy` and
`https_proxy`.

If someday needed this should be reimplemented with urllibs ProxyHandler

Fixes #262

[chatstate] fix color converting from gtk floats

See merge request !59

Updated old Urls in code and manifest.

OMEMO Make some more strings translatable

See merge request !57

[preview] Display preview beginning with a new line and add tooltip

See merge request !56

available

Even if we dont need account for omemo, its easier to supply always
the same count of arguments to all encrypt_file() plugin methods.

[OMEMO] Make some strings translatable

See merge request gajim/gajim-plugins!54

Now we dont need to supply the account