PropertySupport: Make methods accessible prior to invocation

[deploynix]

Mapping list elements like so:

assertThat(collection).onProperty("id").containsExactly(...)

May result in an IllegalAccessException if the elements of the collection are package-local (or otherwise restricted). This can even be the case if the collection contains package-local implementations of a public interface, i.e. in situations where a programmatic invocation of the getter works.

Invoking method#setAccessible(true) prior to invocation of the property set/get methods would resolve such issues.