Integrated DE plugin functionality.
Reworked DE components:
- TKDESTEP: Handling STEP file format.
- TKDEOBJ: Handling OBJ file format.
- TKDEIGES: Handling IGES file format.
- TKDEGLTF: Handling GLTF file format.
- TKDEVRML: Handling VRML file format.
- TKDEPLY: Handling PLY file format.
- TKDESTL: Handling STL file format.
Reworked DE DRAW components:
TKXSDRAWSTEP: Container for DE command to work with STEP.
TKXSDRAWOBJ: Container for DE command to work with OBJ.
TKXSDRAWIGES: Container for DE command to work with IGES.
TKXSDRAWGLTF: Container for DE command to work with GLTF.
TKXSDRAWVRML: Container for DE command to work with VRML.
TKXSDRAWPLY: Container for DE command to work with PLY.
TKXSDRAWSTL: Container for DE command to work with STL.
TKXSDRAW rework to be base DRAW plugin to keep DE session and utils.
Updated documentation
Updated samples
* Menu storage changed from json to XML (because Qt 4 does not support json)
* C++11 for(object : container) construction changed to OCCT iterators / Qt foreach
* enum type::name changed to type_name
* non used class members removed
* Qt connect functions changed to macros version
* warning 4127 disabled for Q_INIT_RESOURCE in VS2010 / Qt 4 case
* widgets parent problem on Qt 4 fixed
* QRegularExpression changed to QRegExp
Added Qt sample OCCTOverview providing examples of use of OCCT API with relevant code and demonstration of results in the viewer.
Off-topic: some unused images are removed from dox/introduction/images/
