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Automatically hide some core options depending on rom image type

- loading gba games will automatically hide gb/gbc only related core options at startup
- loading a gb/gbc game will also hide gba only options...

retro_get_memory_data/size and memory descriptors update

- this is a temporary variable and should only affect on this section, and not the global one.

- minor n0n-functional changes
- cleanup gb built-in palette struct
- update retro_get_memory_data/size to directly use related variables for RAM and VRAM
  and fix sizes (GB vs GBC pointers and pointer size) for proper cheat search support.
  You can now access full 32K ram of GBC for example.

This fixes builds with clang on windows.

We set using the QWERT keyboard as a reference. These keys should
be located at fixed positions on most QWERT keyboards.

KEY    | KEYBOARD
-------|----------
UP     | W
DOWN   | S
LEFT   | A
RIGHT  | D
A      | L
B      | K
R      | O
L      | I
SELECT | Backspace
START  | Enter

- Fix #463.

Besides that, we also rename the button for all input to `Clear All`.

- Fix #416.

Add option to remove all configuration related to checking for updates
online. Although it is not implemented at the moment, these options
appeared on our menu `Options` > `General ...`.

- Fix need of patch on #140.

It is not possible to pre-select a file with `wxFilePickerCtrl`. Hence,
we add a label to show the current gopts.{gba_bios,gb_bios,gbc_bios} is
being used, if any.

- Fix remaining of #196.

Several toggle options from the main menu could not be handled by the
key shortcuts. This was mainly because the code was only checking if
they were ticked or not.

When a key shortcut was pressed, the key itself did not trigger the
tick of the box from the menu, hence nothing was being done.

We are not setting the debug ones because they are not being missed
by the users (yet).

- Fix remaining of #88.

We use the following key input if the config `vbam.ini` does not exist:

input  | keyboard
A      | A
B      | S
L      | Q
R      | W
SELECT | Z
START  | X

We also set a joystick default, using the XBOX 360 controller as a
base.

- Fix #463.

The idea of these was to show them available in `Options` >
`Key shortcuts` and allow the user to rebind them. We want the users to
use the keys rather than trying to change the volume via menu actions.

libretro: add SIO Control, normal mode reg

Update README.md

- emulate SIOCNT reg, which is still needed for some games to trigger IRQ's even in single, non-link mode
- Fixes Digimon Racing (Europe) stuck in intro as reported in libretro docs page https://docs.libretro.com/library/vba_m/#compatibility
- Related PR: https://github.com/libretro/vbam-libretro/commit/f9efb79a7d5ce3463987b260f558cf90ae3289f0#diff-385704891f00846c986e9056b5d7c5a5

Gb timing updates

Similar update to GBA which does the following:
- reduces input lag by 1 frame by reading user input at beginning of cpu loop
- audio and video timing update, which sends audio and video at every frame possible
- add missing sound state variable, soundTicks for gb and gba

For ninja.
Signed-off-by: Rafael Kitover <rkitover@gmail.com>

Map initial state of axis to 0. This is sufficient for the time being
for the 360 triggers to work better.
Signed-off-by: Rafael Kitover <rkitover@gmail.com>

gb palette fix, color correction and cleanup

- Prevent GB type hardware change during runtime.

a few gb updates