Gtk: add support for file:/// uri for glade Template class property

Originally by Jesus Bermudez, rebased and finished off by Philip
Chimento.

Closes #108.
11 jobs for wip/jjesusbv/786439-add-support-for-file-uri-to-glade-template in 37 minutes and 6 seconds (queued for 8 seconds)
Status Job ID Name Coverage
  Source Check
passed #28285
cppcheck

00:02:03

passed #28286
cpplint

00:01:22

passed #28287
eslint

00:01:00

passed #28284
fedora

00:16:02

 
  Test
passed #28288
fedora_clang

00:10:05

 
  Thorough Tests
passed #28290
installed_tests

00:03:56

manual #28294
allowed to fail manual
lts
manual #28293
allowed to fail manual
no_graphics
passed #28289
no_profiler

00:05:16

passed #28291
sanitizer_gcc

00:10:09

manual #28292
allowed to fail manual
valgrind