Remove redundant #include <cstdint> in several places
dispatcher: __builtin_cpu_supports is only available on x86

This is a critical bug that breaks build on ARM with GCC
cmake: Build the documentation only after the library is tested
Several fixes in QtCreator project files
Release 0.9.3

Commit 0cadc5cac3a2b0e2553b01c6f58cc8054294417e fixes a critical bug.
cstdint -> stdint.h; cstdint doesn't always exist on a mac (sometimes it's tr1/cstdint)
{} initializers to ()
constexpr -> const
no particular need for postfix return type
static_assert -> SIMDPP_STATIC_ASSERT
some returns made explicit
if this is going to live in a branch, no point to the #if
math_shift returns
replace std::array and auto in make_shuffle_bytes_mask
all returns explicit now?
compare.h doesn't need postfix return types either
unused variables in memory_{load,store}.h
remove brace initializers from memory_{load,store}.h
Merge branch 'cxx03' of https://github.com/mtklein/libsimdpp into cxx03

Conflicts:
	simdpp/simd/extract.h
	simdpp/simd/int16x16.h
	simdpp/simd/int16x16.inl
	simdpp/simd/int16x8.h
	simdpp/simd/int16x8.inl
	simdpp/simd/int32x4.h
	simdpp/simd/int32x8.h
	simdpp/simd/int64x2.h
	simdpp/simd/int64x4.h
	simdpp/simd/int8x16.h
	simdpp/simd/int8x32.h