Option to omit UnityBegin/UnityEnd calls in generate_test_runner

Remove exactly duplicated 'else if' branch

Refactor/split mem from fixture

Sigh. had to NOT disable these warnings by default because the gcc on our test rig doesn't understand it

While we're fixing warnings / errors, disable this (otherwise helpful) error because we are purposefully making this example file fail for this.

Fix TEST_ASSERT_HEX64_ARRAY_WITHIN truncating delta to 32 bits

By passing --omit_begin_end=1 to generate_test_runner.rb, the script
will now omit calls to UnityBegin and UnityEnd when running tests in a
suite.

This allows multiple suites to be executed in a row, and then have an overall
summary of the tests which were executed across all suites.

Make verifyTest() leave Ignores and Callbacks intact

Stopped supported -0 as a float output because (a) it is non-portable, only existing on some architectures and (b) relies on the undefined behavior of 1.0/0.0

Fix CMakeLists

Fix docs.

- fixed ANSI (C89) issues, including #418

Added num_elements parameter to docs for TEST_ASSERT_INTn_ARRAY_WITHIN

Convert RUN_TEST() to a function

Converting RUN_TEST() from a macro to a function significantly reduces the size
of the compiled binary.  On amd64, the largest test runner in the test suite
(testsample_DefaultsThroughCommandLine_runner.o) was reduced from 3.4 kB to 2.4
kB (stripped).