Allow multiple products based on glob

Currently qbs requires defining a product for each output and this has to be defined statically. It would be nice if this could be dynamically so that creating a file is enough to create a new executable/test.

For example the following works in bazel:

[cc_test(
	name = src[len("test/"):-len(".cc")],
	srcs = [ src ],
	deps = [
		"//external:gtest",
		":testlib",
	],
) for src in glob(["test/*_test.cc"])]

Which creates a test target for every file in the directory. It would be great if the same could be acomplished in qbs.