Merge branch 'master' of github.com:qreal/qreal into robots
Removed hack for saving label properties in their values (titles may temporary work inconsistently);
Fixed lines ignoring by sensors on some archs;
Fixed segfault when riding along the line with one light sensor (239 bug #1);
Fixed segfault when closing QReal instance with working interpreter.
Merge branch 'master' of github.com:qreal/qreal into robots
Styleguide fixes + some little optimizations
Some more styleguide fixes
Merge pull request #966 from dvvrd/robots

2D model critical fixes