Enable setting object visible under datainput control

Currently object visibility can be adjusted with eyeball icon in the timeline panel. Datainput supports boolean dataype that could be used to switch true/false type properties such as eyeball, but UI has no enablers for that.

Proposed solution: add "Visible" or "eyeball" property control to the property panel. Object visibility can be toggled on/off using this toggle, or the current method of toggling eyeball icon in the timeline.

Add datainput icon next to the toggle. When clicking, datainput select dialog appears and user can select the controlling DI (similarly to how control for other properties is toggled). 

Control is indicated by turning datainput icon orange in the property panel, but also additionally by replacing eyeball icon in the timeline by orange datainput icon. Property panel control will remain functional so in the editor user can toggle visibility on/off to help editing. Timeline should probably also react to clicking so that when datainput indicator is clicked, the object is returned to default visible state (=eyeball icon shown and DI control removed).