Added two properties to the plugin:
* ignored-event-types: A list of event types to be ignored when logging events
* logged-event-types: A list of event types to be logged when logging events
This commits also moves the "ignored-event-fields" property to using a proper
GstValueList for the list of event fields to be taken into account, instead
of the home grown separated by comas list of string, making the API more
uniform.
This also adds a simple helper method: `gst_validate_utils_get_strv`
We use visual studio module definitions for the list of symbols to
export when targetting Windows. Fixes CI failure:
../validate/tools/gst-validate.c:460: undefined reference to `gst_validate_spin_on_fault_signals'
With the addition of the .def file for validate we need to make
sure the check-export script from common gets executed so that the
.def stays up to date.
https://bugzilla.gnome.org/show_bug.cgi?id=774638
