[Feature Request] more flexible Controller Input Mappings depending on type of controller

I would like to see some Kind of Controller Type setting something like : "SNES Style" (4 Buttons on the Front) and "GENESIS/SAT/Fightstick Style" (6 or 8 Buttons on the front).

At moment the whole RA Retropad concept Just centered arround snes/PS Style Controller and for everything else you need to use overrides/remappings to get the most out of the devices.

in a perfect world:
after the initial controllerbinding you can choose a controller type for your device ("SNES Style" or the other mentioned type) . than every core gets mapped perfectly for your device without changing everything because RA "knows" what your Controller looks like.

an nice alternative would be a core-option with this settings (controller-type: snes-style with "4+2" or saturn/arcade stick Style with "6+2" Buttons).

For now (in the real world^^) you can bind a 6/8-button SATURN Style Pad in 2 ways...
Saturn Controller Layout:

Shoulders: L - R

Buttons on the front:

                              X-Y-Z 


                              A-B-C 

for example:
if you want to play Megadrive/Genesis/PCE/3DO Game with a 6-Button genesis/saturn pad you need following binding...

Variant 1)

Retroarch -> Controller

RP_A -> PAD_C

RP_B -> PAD_B

RP_X -> PAD_X

RP_Y -> PAD_A

RP_L1 -> PAD_Y

RP_R1 -> PAD_Z

RP_L2 -> PAD_L1

RP_R2 -> PAD_R1

if you want to play Final Burn Neo, Saturn ,SNES, PS1 . you need a 2nd Binding-variant.

Variant 2)

Retroarch -> Controller

RP_A -> PAD_B

RP_B -> PAD_A

RP_X -> PAD_Y

RP_Y -> PAD_X

RP_L1 -> PAD_C

RP_R1 -> PAD_Z

RP_L2 -> PAD_L1

RP_R2 -> PAD_R1

yeah, i know you can allways set per game/core remapping but in my opinion its not a great solution. f. e. setting up a core-remap for genesis and 6-button pad and it will be the "wrong" (unintuitive) mapping for a SNES-Style Pad with that core and vice versa.

and yeah i know, it would be a pain making it work (basicly all core-mapping and controller profiles needed to be updated) but then it woul be possible to play every core with every controller and still getting the best possible experience)

As a not very nice by-product there are different controller profile-styles for same type of pad.

RA Profile for 8bitdo M30 is mapped with variant 1 to play fine with Megadrive/Genesis
but another fightpad with same button-layout is mapped with variant 2 to play nice with saturn, fbneo.

No files, tests, or entry points are identified. Start by reviewing RetroArch's controller binding, controller profiles, and core-remapping behavior described in the issue. Done should mean a controller type can be selected so the relevant cores receive suitable mappings without per-game or per-core remaps.