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Makefile fix to enable build for "unix-armv7-hardfloat-neon"

Make transparency effects configurable

Reintroduce this option, which was present in the upstream version this
was forked from, to allow slower platforms to opt for improved frame
rates where rendering accuracy is not critical.

Add optional low pass audio filter

Improve save state efficiency

Various Improvements

platform/miyoo: Fix build flags and use FAST_ALIGNED_LSB_WORD_ACCESS

Backport FAST_ALIGNED_LSB_WORD_ACCESS from snes9x2005@c5d385d6
and snes9x2005@2572e073.
Fix build flags for miyoo, which were not correctly applied, opt-in to
FAST_ALIGNED_LSB_WORD_ACCESS as in libretro/snes9x2005#93, and use LTO
to squeeze a bit more performance and reduce the binary size by 4%.

gfx: Remove unused settings and code

platforms: Add Miyoo target

Add this, with Arm ASM optimisations, as a faster alternative to the
2005 core.

Drop S9xInitUpdate() which is only a stub here and was originally used
upstream in the Windows port until 1.52 where it was unused in the
Windows port as well. This function has already been removed in the
libretro snes9x2005 and 2010 cores.

Also drop checking the Settings.SixteenBit flag as this fork no longer
contains 8bpp graphics rendering code.

Microopt

Use the gcc built-in function, making the operation constant-time and
branch-free.

Use {READ,WRITE}_WORD so that it copies by word on little-endian
platforms. Mark LUTs const for const-correctness.

Fix regression introduced in snes9x-1.40.

As it's only incremented here and then reset to 0, avoids integer
division, which can be be expensive on CPUs without this instruction
such as pre-ARMv7 classic ARMs.

Adds auto-frameskip based on audio capacity

Adds frameskip based on audio buffer capacity, based on implementations
from other cores. "frameskip_interval" setting is used to set maximum
number of skipped frames for all frameskip types, rather than hardcoding
to 30. This allows adjust pacing when it can't keep up.

This reverts commit e31ada35.