wpe: Add a source element acting as a Web Browser based on WebKit WPE

The wpe element is used to produce a video texture representing a web page
rendered off-screen by WPE. This element can be used to overlay HTML on top of
another video stream for instance.
4 jobs for wpe in 4 minutes and 33 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Preparation
passed #57694
gst indent

00:00:28

passed #57693
manifest

00:00:18

 
  Build
passed #57695
build fedora x86_64

00:01:28

 
  Full Builds
passed #57696
build android arm64 api28

00:02:18