On Windows, WPAD, PAC and manual proxy settings are not mutually
exclusive. They can all be set and should be tried in that order.

Release curl handle in dispose.

Co-authored-by: Jan-Michael Brummer <jan-michael.brummer1@volkswagen.de>

In case release option is set to true, no git hooks are installed to the
system.

Fixes: #262

Co-authored-by: Jan-Michael Brummer <jan-michael.brummer1@volkswagen.de>

px_proxy_factory_get_type and px_proxy_factory_copy should be in symbol
map. Add it.

Fixes: #281

Co-authored-by: Jan-Michael Brummer <jan-michael.brummer1@volkswagen.de>

Fixes: #285

Co-authored-by: Jan-Michael Brummer <jan-michael.brummer1@volkswagen.de>

Co-authored-by: Jan-Michael Brummer <jan-michael.brummer1@volkswagen.de>

The second argument to g_boxed_copy() is meant to be a pointer to the
boxed instance itself, not a pointer to a pointer to the boxed instance.
For example, `g_boxed_copy (G_TYPE_STRV, environ)` is correct (equivalent
to g_strdupv() in this case), but `g_boxed_copy (G_TYPE_STRV, &environ)`
would be incorrect. The same principle applies here.

The test passed despite this because self->pf and
&self->pf happen to both be pointer-sized, and as a result of
#280, the data that is pointed
to was copied byte-by-byte but not otherwise used; but this will no
longer be true when #280 is fixed, so the test needs fixing first.

Signed-off-by: Simon McVittie <smcv@debian.org>

Otherwise there is no guarantee that the object will continue to exist
after the original factory is destroyed, and both the copy and the
original factory will try to unref it when destroyed, which is a
programming error.

Resolves: #280
Signed-off-by: Simon McVittie <smcv@debian.org>

Previously the copy was never freed, which hid the bugs fixed by the
previous commits.

Reproduces: #280
Signed-off-by: Simon McVittie <smcv@debian.org>

Fails to build with:

../src/backend/plugins/config-osx/config-osx.c:284:29: error: 'SCDynamicStoreCopyProxies' is unavailable: not available on iOS

Which is true, it's only available on macOS 10.1+

https://developer.apple.com/documentation/systemconfiguration/1517088-scdynamicstorecopyproxies