frei0r problem with the range of f0r_param_double

Hi,

the spec of frei0r says that the allowed value range for a double 
parameter is from 0.0 to 1.0.

For many parameters it is possible to map the needed range in that 
interval, but some parameters that aren't bounded by a upper and lower 
limit.

E.g. the video delay effect "delay0r" has a delay time parameter. It 
isn't possible to find a sensible upper boundary for the delay time.

There are some other frei0r plugins that accept values outside of that 
valid range. The current gephex version interpret this range 
specification only as a gui hint for sliders and doesn't enforce it in 
any way. It is possible (and for some plugins necessary) to pass values 
outside of the specified range.

I think we must eliminate this discrepancy between spec and usage:

Solution A:

Keep the current specification (MUST be in the range) and add an 
additional parameter type (f0r_param_unbounded_double) for unbounded 
double values.

Solution B:

Change the range specification from "MUST be in the range" to "SHOULD be 
in the range". And add adapt the existing frei0r plugins to clamp the 
values to the [0,1] interval if other values are useless.

Any comments?

Martin

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