Added AST visitor interface to qrtext lib
Added a prototype of lua printer into the arbitrary language.
TODO: Still listing expressions do not work and branckets are added always.
Merge branch 'master' of github.com:qreal/qreal into lua-printers
mouse gesture widget is fixed
Some genreators architecture modifications due to lua printing;
Added brackets printing heuristics
Accomplished lua translation to qts;
TODO: add semicolons to the end of alone expressions
Added lua printers to nxtOSEK C and russian C.
resizing gesture widget without repainting
Merge branch 'master' of github.com:qreal/qreal into lua-printers

Conflicts:
	plugins/robots/generators/trikGenerator/templates.qrc
Merge branch 'master' of github.com:qreal/qreal into lua-printers
dragging of walls onto the robot is fixed
Merge branch 'master' of https://github.com/qreal/qreal into 2dWallsDraggingFix
excess field is removed
Scroll area removed from editor preferences
Merge branch 'master' of github.com:qreal/qreal into lua-printers
New types analizer reused in generators
Time variable modified to time function in generators
Made it compiling under windows
Version extended to 3.0.0 beta0!
Added ev3 component into installer;
Added qrtext lib into installer