Support an Initial Time Only mode for Time layers

[tariqksoliman]

In some cases we want MMGIS to construct and query the initial time url but then have all its following queries be controlled by an mmgisAPI user.

If a layer has:

• Url: set to anything
• Controlled: checked
• Time Enabled: true

it shall only automatically perform the initial request, with time properties filled in, of the vector layer.

If other words:
if(config.controlled === true) { //preventTimeUpdatesWhenMMGISTimeChanges }