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UPBGE: Allow asynchronous mesh libload. #897

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Previously only scene supported asynchronous libloading.
But the loading of meshes and scenes are similar in the point
that they both use a scene converter but with a different
procedure on the data to convert and register to this scene
converter.

This commit introduce a more flexible KX_LibLoadStatus
with the usage of a lambda function which receive as argument
one of the scene converted listed in KX_LibLoadStatus and
process the conversion.

This lambda is created in BL_Converter::LinkBlendFile
in the same time than a list of scenes used to create the
scene converters is built. KX_LibLoadStatus is constructed
passing the function and the scene list.

BL_Converter also replaced the usage of blender task scheduler
by TBB. A tbb::task_group and a std::mutex is now hold.
The function BL_Converter::ConvertLibraryTask is in charge to
call the conversion function and this function can be called
by a task group or manually which help to reuse code.
As before BL_Converter::LinkBlendFile, is reponsible to
do a direct conversion or launch a conversion asynchronous task.

Fix issue: #533.

Previously only scene supported asynchronous libloading.
But the loading of meshes and scenes are similar in the point
that they both use a scene converter but with a different
procedure on the data to convert and register to this scene
converter.

This commit introduce a more flexible KX_LibLoadStatus
with the usage of a lambda function which receive as argument
one of the scene converted listed in KX_LibLoadStatus and
process the conversion.

This lambda is created in BL_Converter::LinkBlendFile
in the same time than a list of scenes used to create the
scene converters is built. KX_LibLoadStatus is constructed
passing the function and the scene list.

BL_Converter also replaced the usage of blender task scheduler
by TBB. A tbb::task_group and a std::mutex is now hold.
The function BL_Converter::ConvertLibraryTask is in charge to
call the conversion function and this function can be called
by a task group or manually which help to reuse code.
As before BL_Converter::LinkBlendFile, is reponsible to
do a direct conversion or launch a conversion asynchronous task.

Fix issue: #533.
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