Allow non-default parameter utcNow() calls

[tsujp]

Is your feature request related to a problem? Please describe.

utcNow() as per the documentation can only be assigned as the default value of a parameter. This means if the sole function of using utcNow() is to calculate some time T in the future (for example for SAS token expiry) then a parameter is being exposed when it ought not to be.

Describe the solution you'd like

Allow utcNow() to be called anywhere inside the template and/or templateStartTime() (or better-named) to be called anywhere inside the template which has the time the instant the template was invoked (what utcNow() as a default parameter does now, but while keeping utcNow() unchanged).

[anthony-c-martin]

What about exposing a property on the deployment object - e.g. deployment().startTime?

[tsujp]

Sounds good to me.

[codehunter13]

any progress on this?
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