Add test runner

This patch adds a "magic" test runner which discovers all test cases in the
executable into which it is linked. This is achieved through the use of a
special macro used to declare tests, so that they are added onto a linker-
generated list. The linker list logic is largely taken from U-Boot source code,
with minor some tweaks made.

This linker-generated list is then used at runtime in order to pick out every
test case which can be run, resulting in a cross-file "suite" of unity unit
tests, rather than separate test executables per module. A sample test module,
test_test.c is provided to illustrate the test runner's ability to correctly
discover tests across multiple translation units.

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