info: re-eval GST_DEBUG env var for late categories
info: re-eval GST_DEBUG env var for late categories

When registering a new debug category after _debug_init(), we need to
re check the GST_DEBUG filter settings again.
In addition when parsing the filter setting, we need to already bump up
the min-debug level to not suppress debug log statments that dynamically
register a category. This happens in libraries that use a function to
register a category on first use.

StreamUtils/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer,StreamUtils/gstreamer