- Add some jobs to build sight on Linux, Macos and Windows
- Launch unit-test
- Use ccache to reduce build time

Merge branch '195-add-windows-and-macos-as-gitlab-ci-target' into 'dev'

Resolve "Add windows and macos as gitlab CI target"

Closes #195

See merge request Sight/sight!81

It is now possible to create a source package for a specific application.
To do so, you have to:

- Choose an app you'd like to package. (e.g. VRRender, OgreViewer,...) This needs to be an **installable** app make sure it calls `generic_install` in its `CMakeLists.txt`
- Set it (and only it) as the `PROJECTS_TO_BUILD` in your cmake config.
- Run cmake `cmake .`
- Build the source archive, if building with ninja you can run `ninja package_source` else run `cpack --config CPackSourceConfig.cmake`
- Retrieve the source archive (e.g. VRRender-0.9-Source.tar.gz if you chose VRRender).

Closes #246.

## Some results

A source package example : [PoCRegistration-0.1-Source.tar.gz](/uploads/a4fdd05b1681b7f01c1c553903f0f072/PoCRegistration-0.1-Source.tar.gz)

## Additional tests to run

This should better be tested on all platforms.

- [x] Windows
- [ ] ~~macOS~~ :arrow\_right: won't work see #248 
- [x] GNU/Linux

See merge request Sight/sight!128

The compositor uniforms are now properly shown in the compositor selector. 
The application no longer crashes at exit when all lights are removed.

Closes #220

Merge branch '220-fix-ogreviewer' into 'dev'

See merge request Sight/sight!111

Merge branch 'move-opmatrix-sdecomposematrix-to-sight' into 'dev'

Add a new service to decompose a matrix into a rotation matrix, a translation matrix and a scale matrix.   
Add a new sample using this service.

See merge request Sight/sight!118

see #72

* Correct the duration calculation.
* Use total number of frame and current frame index to loop the video.

Merge branch '252-opencv-grabber-loop-mode-duration' into 'dev'

Resolve "OpenCV grabber loop mode & duration"

Closes #252

See merge request Sight/sight!132

This MR removes all IDVR references from OgreViewer. This makes the application simpler, 
because over time it accumulated too many features.

In the same time, we added volume rendering and negatoMPR adaptors to the VTK tab,
in order to show the comparison between the two back-ends.

OgreViewer has been updated to 0.3.

Merge branch '204-move-idvr-to-non-free' into 'dev'

Closes #204

See merge request Sight/sight!104

see #253

slow tests are enabled if FW_IGNORE_SLOW_TESTS is not defined, empty or equal to 0

As the signal emission is asynchronous, we need to wait for the signal reception.

see #72

Merge branch '243-remove-deprecated-services' into 'dev'

Resolve "Remove deprecated services"

Closes #243

See merge request Sight/sight!126

- decompose the matrix into rotation, translation, scale, skew and perspective
- update documentation

- running unit tests in another dedicated job is quite difficult with cmake on gitlab-ci
- split of these jobs will be reintroduced later