#438: validationstate

[slskiba]

Closes #438. added exemplary usage to InstallCommandlet

TBD:

• Exemplary usage added in InstallCommandlet checks whether the given version is a valid one - this is a relevant check for a VersionProperty at any given place - should they now each implement an identical validator?
• PathProperty solves this by overriding validate(), to implement general Path-related validation - or should this move into validator implementations?

[coveralls]

Pull Request Test Coverage Report for Build 10777736263

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 134 unchanged lines in 14 files lost coverage.
• Overall coverage increased (+0.05%) to 65.656%

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Files with Coverage Reduction	New Missed Lines	%
com/devonfw/tools/ide/property/StringProperty.java	1	88.89%
com/devonfw/tools/ide/property/EditionProperty.java	1	83.33%
com/devonfw/tools/ide/url/model/file/UrlDependencyFile.java	1	70.0%
com/devonfw/tools/ide/property/FileProperty.java	1	80.0%
com/devonfw/tools/ide/property/NumberProperty.java	1	87.5%
com/devonfw/tools/ide/property/ToolProperty.java	2	90.91%
com/devonfw/tools/ide/property/FolderProperty.java	3	0.0%
com/devonfw/tools/ide/property/CommandletProperty.java	3	81.82%
com/devonfw/tools/ide/commandlet/InstallCommandlet.java	3	75.0%
com/devonfw/tools/ide/commandlet/Commandlet.java	4	87.5%

Totals
Change from base Build 10770364106:	0.05%
Covered Lines:	5945
Relevant Lines:	8729

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💛 - Coveralls

[hohwille]

@slskiba thanks for your rework. You created a solid state and are almost there. 👍
I left some comments to guide the way.
Once addressed, we can finally merge.