ges: Use registry to select the compositor element
text-overlay: added text properties as child-properties
Makefile: Add usage of build-checks step

Allows building checks without running them
ges:validate: Port to the new handles-states API
ges-validate: Let GstValidate handle assert logs
tools:validate: Concider seek in PAUSED position being not exact as WARNING

In some corner cases in GNL it is totally correct that a position in a
seek in paused is not perfectly exact
ges-validate: Port to the new GstValidate action registration API
ges-validate: Rename edit-clip to edit-container

So it represent better what the action does at the GES level
ges-launch: Fix compiler warnings

ges_validate_print_action_types() takes a const gchar **.
ges-launch: Fix typo in --help output
validate: Add the "ges" as implementer namespace for our action types
validate: gst_validate_print_action_types now takes a const gchar **
ges-launch: clean up help page

https://bugzilla.gnome.org/show_bug.cgi?id=735121
ges-launch: option to select encoding profile from xml

https://bugzilla.gnome.org/show_bug.cgi?id=735121
configure: bump (soft) gst-validate requirement

Won't build against all older git versions with
0.0.1.0 as version number.
Release 1.3.90
tests: project: Make test_project_add_keyframes compatible with _update_control_bindings
tests: project: Add children properties check

Rename test_project_add_keyframes into test_project_add_properties
formatter: save and load source's children properties