Rewrite ParameterSelection class to return parameter value instead of its index

[qgib]

Author Name: Alexander Bruy (@alexbruy)
Original Redmine Issue: 7573

Redmine category:processing/core
Assignee: Victor Olaya

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This is rather proposal than new feature or bug.

Currently ParameterSelection accepted list of possible values and returns an index of the selected value. Maybe it makes sense to rewrite it and return value. Such approach has some advantages: using Python dict type it is very easy to show descriptive names to user and in same time pass to algorithms correct values with necessary type (string, int, double...)

If this will be accepted, issues described in #5689 will gone

[qgib]

Author Name: Alexander Bruy (@alexbruy)

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• category_id was configured as 63

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• category_id removed 63
• project_id was changed from 78 to 17

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• category_id was configured as Processing/Core

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• assigned_to_id was configured as Victor Olaya

[qgib]

Author Name: Alexander Bruy (@alexbruy)

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Fixed in master. Options can be defined as (value, text)

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• resolution was changed from to fixed/implemented
• status_id was changed from Open to Closed