dependency version restrictions

[Noam-Dori]

Feature:
Autocompletion for version dependency, with additional inspections

Background
Sometimes a package depends on specific versions of another package. The attributes version_COMP specify that.

Details

• Add autocompletion for the attributes of version ranges, and suggest the current version of the target package (if applicable) as a value.
• Add an inspection that checks the validity of that dependency.
• Add annotation for the value of the attribute (must be valid version)
• Limit autocompletion to only be of version ranges (one max, one min)
• Add annotation for conflicting version attributes. (lt + lte, gt + gte, eq + any of the others)
• Add inspection for non matching version attributes for similar dependencies.
• suggested value for the attribute should be the package's current version (if one exists)