Add the following macros for UT assert:

UtAssert_INT32_EQ - check equality as 32 bit signed int
UtAssert_UINT32_EQ - check equality as 32 bit unsigned int
UtAssert_NOT_NULL - check pointer not null
UtAssert_NULL - check pointer is null
UtAssert_NONZERO - check integer is nonzero
UtAssert_ZERO - check integer is zero
UtAssert_STUB_COUNT - check stub count

These are all just wrappers around UtAssert_True for
commonly-used asserts.  The description message is
auto generated so it is consistent.

Some systems may not provide this type.  Using "unsigned long" instead
should be sufficient.

Fix #502, Add extra assert macros

Fix #509, Remove uintmax_t usage