fixing spelling mistake in eastl::basic_string

Fix for insertion_sort() doing a --(BiDirectionalIterator.begin()) which is an illegal operation and causes crashes on containers such as eastl::deque.

eastl::optional_storage - remove unneeded union and trivial type initialization since we use eastl::aligned_storage_t, remove unreferenced internal member function

resolving 32-bit eastl_size_t compiler error

EASTL_ALIGN_OF porting to C 11 alignof keyword.

EASTL_EMPTY_REFERENCE_ASSERT_ENABLED when enabled would not assert when taking a reference to an empty container.
Example, eastl::vector[0] would not assert that a null reference was being taken if the vector was empty.

fixing shared_ptr compiler error when passing nullptr with a custom deleter lambda

fixed unique_ptr::reset() instructions order. Internal pointer must be updated before deleting object (#373)

fixed unique_ptr<[]>::reset() instructions order. Internal pointer must be updated before deleting object (#375)

fixed adl with exchange inside unique_ptr to be fully qualified

fix bitvector iterators (#358)
use mContainer.begin() instead of &mContainer[0],
since it causes out of bounds exception in non release build

Fix circular dependency in fixed_function.h (#350)