[gmpi] Re: lost-n-found #3 parameter stuff

Here's what I have added, any commplaints?

Req 45:  Added filename to the list of parameter types

Req 46:  All parameters must have associated metadata (e.g. name, minimum
value, maximum value). Metadata will vary depending on the parameter
datatype. All parameters must provide a default value. Plugins should
                                                       ^^^^^^^^^^^^^^
handle invalid parameters safely. 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Req 48:  GMPI plugins must be able to to present value strings for
parameter values which do not map linearly.

More:

Quite often a plugin will expose a parameter as a linear value range,
such as 0.0-1.0 or 0-1000, but the implementation will use some non-linear
mapping to produce the actual internal value.  For example, volume might
be a 0.0 to 1.0 range, but the actual dB value represented by the fader is
non-linear.  In these cases, plugins must be able to provide formatted
strings for the host to use in place of the literal parameter value.

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