Get zoom from session in resources load view

Add a listener in order to update the value in the session when user changes the
zoom.

For the company view it will use it's own variable to store the zoom level,
inside a project it will use the zoom variable shared for all the project views.

FEA: ItEr77S15FilteringEnhancements
Get zoom from session in advanced allocation view

Add a listener in order to update the value in the session when user changes the
zoom.

FEA: ItEr77S15FilteringEnhancements
Fix problem with session zoom level in project Gantt view

If the zoom level was changed in other view inside a project, Gantt view didn't
notice it.

FEA: ItEr77S15FilteringEnhancements