Implicit dependency fallback when a subproject wrap or dir exists

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+## Implicit dependency fallback
+
+`dependency('foo')` now automatically fallback if the dependency is not found on
+the system but a subproject wrap file or directory exists with the same name.
+
+That means that simply adding `subprojects/foo.wrap` is enough to add fallback
+to any `dependency('foo')` call. It is however requires that the subproject call
+`meson.override_dependency('foo', foo_dep)` to specify which dependency object
+should be used for `foo`.