Lists of objects were wrongly initialized, creating a useless performance hit. All the objects of the "for each" were copied into arrays, before being emptied. And this, for every single object in the for each loop. This was particularly bad when a lot of objects were picked by the for each (if we have N objects, complexity was N*N copies of the array).
* Update all CMakeLists of extensions to use clang-format
* Run clang-format on all Extensions
* Update GDCore CMakeLists.txt to add clang-format
* Run clang-format on GDCore files
* Update GDJS and GDCpp CMakeLists.txt to add clang-format
* Run clang-format on GDCpp and GDJS files
* Declare objects lists used by actions only when actions are launched
for standard events (both GDCpp and GDJS)
* Enable the object list reuse optimisation in GDCpp as done in GDJS.
