Add new rule: all property group should contain

[imanushin]

Sometimes it is needed to check, that each project has custom tag in the each property group.

For example, such tag:

    <CodeAnalysisRuleSet>$(SolutionDir)/../Shared/Common.ruleset</CodeAnalysisRuleSet>

In this case SolutionCop should check all projects

[Litee]

Do you want to check element existence only or value as well?

[imanushin]

@Litee , I planned to reuse this with value.