Android: add more buttons for specific system emulator developers

[soundsnow]

There should be a lot of people complaining about this

ABCDEF
NAOMI, Atomiswave and more arcade machines
Arcade: Fighting games
Sega Saturn and Genesis
NEC PC Engine and PC-FX
Nintendo 64
Bandai WonderSwan (Horiontal: AB+Y or Vertical X+AB)
Nintendo Virtual Boy(AB+Right D-Pad)

ABC+Keypad
sudoku, calculator, math and custom PC keyboard
Arcade: Mahjong machines
Mattel Intellivision
ColecoVision: Standard and Super Action Controller
Emerson Arcadia 2001
Interton VC 4000
Atari Jaguar: Standard and Pro Controller
Nintendo Famicom: Network System Controller, Capcom Mahjong Controller, Power Pad
SNK NeoGeo AES Mahjong Controller
Atari 2600: Keyboard (Actually P1+P2 Keypads is a Keyboard)
Non-Full size keyboard: Computer Keypad
Atari 5200
VTech Creativision
All Signetics 2650-based machines
APF MP1000
Epoch Super Cassette Vision?
Java and Symbian cellphones
more and more unknown possibilities!

[soundsnow]

Landscape and Portrait Solution

[soundsnow]

Java phones

[soundsnow]

Paddle/Analog Stick/D-Pad: 5 buttons
Keypad: 12 buttons
ABC: 3 buttons
Select and Start: 2 buttons
L1L2L3R1R2R3: 6 buttons
28 buttons in total

The current number of buttons is 16, they are not enough at all, the experience is very bad, some developers are forced to add buttons in the core for this

[soundsnow]

There is a fire button in the middle of the D-Pad, which is for the cellphone emulator

[barbudreadmon]

Partially a duplicate of #11273