IAR projects/workspace for CppUTest and tests.

Added CppUTest (library) and CppUTestTest (simulator executable)
projects and CppUTest workspace for IAR (Cortex M4F).

Added IAR-specific tweaks to AllTests.cpp/.h to deal with the lack of
command line arguments in IAR and errors related to returning from
main.

Builds and passes all tests with IAR Embedded Workbench for ARM
version 7.40.2.8570.

Author: Doug Carlson

.gitignore

@@ -76,3 +76,4 @@ m4/ltversion.m4
 m4/lt~obsolete.m4
 missing
 test-driver
+platforms/iar/settings