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
Added element deletion from scene by strike-out gesture
Implemented cutting on diagrams
Added port hints into 2D model sensors to distinguish them
2D model port hints made visible only by hover
Added touch-optimized mode settings
Added on-screen keyboard showing when focusing some editor in touch mode
Merge pull request #1234 from dvvrd/robots

Some usability features for RoboFest
generation of graphical model when saving interpretable metamodel
Merge branch 'master' of https://github.com/qreal/qreal into metamodeling-sk

Conflicts:
	qrgui/qrgui_ru.ts
Merge pull request #1231 from efim/master

setting default value for association
metaeditor only build