Added parentheses around all macro parameters to resolve MISRA 2004
rule 19.10, "in the definition of a function-like macro, each instance
of a parameter shall be enclosed in parenthesis" as tested with the
IAR EW for 8051 compiler, version 9.20.2.

The only questionable change is in "unity_fixture.h" where the nested
macro DECLARE_TEST_CASE in RUN_TEST_CASE prevents surrounding params
"group" and "name" with parentheses.
However, it appears that macro DECLARE_TEST_CASE isn't used elsewhere,
so I eliminated DECLARE_TEST_CASE and put its expansion directly in
RUN_TEST_CASE.  Now the following header files pass rule 19.10:
* unity.h
* unity_internals.h
* unity_fixture.h

For my own project, this change to the Unity test framework allows me
to include my unit test code to be tested against MISRA rules as well,
instead of just production code, to help enforce style and team
guidelines.