* ImageCost throws on instantiation if the given model doesn't contain a colour model
* Changed the default parameter of fit-model-ceres to sfm_shape_3448, which will need to be obtained
* Additionally the app checks explicitly for has_color_model() and will exit if it hasn't got one.

Otherwise an Eigen expression (CWise...something) will be returned and subsequent code will fail.

'did' was only really an external thing, so naming it "SFM" is more clear!

Renamed all references to "ibug2did" to "ibug_to_sfm".

Top level CMakeLists.txt already check '3.1.3' so there is no need to check
it for subdirectories

'project' declare independent block of CMake code. If block is not designed
to be used stand-alone it make no sense to declare 'project'

Adjusted all includes, files and bindings.

If 'REQUIRED' used inside 'find_package' there is no need to check '*_FOUND'
variable. And vice versa - if package is not optional then 'REQUIRED' can be
used instead of 'if(NOT *_FOUND) message(FATAL_ERROR)' block.

Also swapped order of project() declaration and cmake_minimum_required()

I don't think any of them use the nonlin ortho camera estimate anymore

Also move adding -pthreads to examples/CMakeLists.txt, this will eventually have to be modernised as well

Updated all example apps.

It uses pose, shape, blendshapes and contour fitting.

Also removed unnecessary model_points vector