Merge remote-tracking branch 'remotes/origin/EDF_2020_Lot2'

Merge remote-tracking branch 'remotes/origin/EDF_2020_Lot2'

# Conflicts:
#	doc/gui/General/Introduction.rst
#	src/FeaturesPlugin/CMakeLists.txt
#	src/GeomAlgoAPI/GeomAlgoAPI_WireBuilder.cpp
#	src/Model/Model_AttributeSelection.cpp
#	src/Model/Model_Document.cpp
#	src/Model/Model_Objects.cpp
#	src/Model/Model_ResultConstruction.cpp
#	src/Model/Model_ResultPart.cpp
#	src/ModelAPI/ModelAPI_Events.h
#	src/ModelHighAPI/ModelHighAPI_Tools.cpp
#	src/ModuleBase/ModuleBase_WidgetMultiSelector.cpp
#	src/PartSet/PartSet_MenuMgr.cpp
#	src/PartSet/PartSet_Module.cpp
#	src/PartSet/PartSet_SketcherMgr.cpp
#	src/Selector/Selector_Algo.h
#	src/Selector/Selector_Intersect.cpp
#	src/Selector/Selector_Modify.cpp
#	src/Selector/Selector_Primitive.cpp
#	src/Selector/Selector_WeakName.cpp
#	src/SketchAPI/SketchAPI_Sketch.cpp
#	src/SketchPlugin/SketchPlugin_Projection.cpp
#	src/SketchPlugin/SketchPlugin_Tools.cpp
#	src/SketchPlugin/SketchPlugin_Validators.cpp
#	src/SketchPlugin/SketchPlugin_msg_en.ts
#	src/XGUI/XGUI_OperationMgr.cpp
#	src/XGUI/XGUI_Selection.cpp