Improve behaviour of vendor filtering for bundle manifest with I18N

[pfistererm]

Currently, vendor filtering is based on the value 'Bundle-Vendor' in the MANIFEST.MF. This works well if the value of the directive is given in the MANIFEST directly. However, if the MANIFEST is localized, it may be the case that the manifst contains a variable and the actual value is given in an additional property file. This case is not handled correctly in the LicenseScout (it uses the name of the variable as the value for the vendor). For such a constellation, reading of the actual value from a property file should be implemented.

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