Added timeline reserved variable
Fixed some expression parser`s bugs;
utils:Number code bettered a bit
Made new expression parser`s numbers compilling in other parts
Fixed some warnings
Timer variable made working by model time when 2D model selected
Added timeline varible generation
Made unary minus operator working for expression parser
fixed uninitialized variable
Merge branch 'master' of https://github.com/qreal/qreal into widgetWOEditor
Merge branch 'widgetWOEditor' of https://github.com/efim/qreal into widgetWOEditor