Zooming anchor moved to scene center
Merge pull request #1202 from dvvrd/touch

Zooming anchor moved to scene center
Merge pull request #1203 from dvvrd/robots

2D model fixes for geek picnic
some unfinished code related to sensor settings synchronization
fixed bug with groups creation
Sensors configuration is now synchronized properly
added .txt to gitignore to stop spamming with usability statistics
Merge branch 'master' of https://github.com/qreal/qreal into sensors-synchronization

Conflicts:
	plugins/robots/robotsInterpreter/details/d2RobotModel/d2ModelWidget.cpp
Fixed too frequent sdf files re-reading
fixed styleguide
Merge pull request #1204 from qreal/sensors-synchronization

Sensors synchronization + Some optimizations for sdf-based icons
Physics engine moved into strategy class
Added simple physics engine implementation
Added switching between engines in 2D model ui
Merge branch 'master' of github.com:qreal/qreal into physics

Conflicts:
	plugins/robots/robotsInterpreter/details/d2RobotModel/d2ModelWidget.h
	plugins/robots/robotsInterpreter/details/interpreter.cpp
	plugins/robots/robotsInterpreter/details/interpreter.h
Merge pull request #1207 from dvvrd/physics

Switching between physics engines in 2D model
Version incremented to 2.5.2