Syntax Proposals / Ranges as valid values

Is your feature request related to a problem? Please describe. for loops currently allow a specific syntax to define ranges [begin:end:step] or [begin:end]. This syntax cannot be used elsewhere, even if its useful.

Describe the solution you'd like Allow ranges to be standard GBOML objects:

#PARAMETERS
    a = [0:2];
#CONSTRAINTS
    var[i] == 0 for i in a;

This allows to merge the current way of doing for loops with the proposal in #13 (foreach loops), so that there would be only one consistent behavior.

Semantically, a range would be equivalent to its expansion as an array ([a:b:c] === {a, a+c, a+2c, ..., b or the nearest a+ic})

added Feature label

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Demo in b9b68609