Merge branch 'master' of https://github.com/qreal/qreal into metamodelingOnFly

Conflicts:
	qrgui/pluginManager/editorManager.h
	qrgui/pluginManager/interpreterEditorManager.h
	qrgui/pluginManager/proxyEditorManager.h
	qrgui/qrgui_ru.qm
	qrgui/qrgui_ru.ts
	qrgui/view/private/exploserView.cpp
	qrgui/view/private/exploserView.h
Hidden properties removing.
- some comments
- first step of updating diagrams (InterpreterCore needs some refactoring indeed)
diagrams updated
Friendly name and direction moved as static mothod to device implementation
setting default value for association from empty string to "no_arrow" since latter is the default value for it in gui
Removed zoom settings from editor page
Fixed color full sensors generation in function blocks
Removed case sensetivity in variables identifiers
Default autosave interval decreased to one minute
Genereated code is now opened only by generate actions triggering
Restored case sensivity;
Sensor variables made starting from lowercase;
Corrected examples;
Fixed file dialogs state saving after cancelling it.
Fixed whole diagram selected after opening.
fixed metamodel opening.
Fixed #1219
Implemented smart generated example number incrementation for nxt
Added selecting element on tap
Fixed broken program running from the enviroment on TRIK
Merge pull request #1233 from dvvrd/robots

QReal:Robots fixes for RoboFest
Fixed segfault on division by zero in expression parser