OLED layout overhaul and initial splashscreen support

[UntrustedRoot]

This was initially pushed here: FeralAI#58
Ported everything to community editions changes. This PR is at feature parity to the previous PR (plus a little surprise.)

Original PR text below:

This PR add several new layouts and includes initial support for a splash screen.

This was originally planned as a smaller PR that spiralled out of control.

Let me know about anything you need changed, scrapped, or added. I could use a little bit of help testing these changes against different setups.

Problems with this PR

• Nothing here has been tested with the WebUI. I only built using pico-fighting-board and tested on a breadboard.
• This might break leds.cpp and led support. I'm not setup to test this at this time. See lines 203-205 in leds.cpp
• This might not respect your current settings if you used the ARCADE layout before
• I have no business codding in C++, and I thank you for allowing me to contribute 😄

Layouts changes

• Split the layouts into two halves, allowing for mix-and-match button and stick layouts.
• Renamed ARCADE layout to UDLR
• Removed buttons from ARCADE, HITBOX, and WASDB. Created ARCADEB, HITBOXB, and WASDB from removed button layouts
• Replaced ARCADE with an 'animated' arcade stick.
• Added the following layouts:
  • MIXBOX: WASD, but with keyboard style buttons
  • MAME: Keyboard style layout. More of a cosmetic layout for the display. 6 buttons.
  • VEWLIX
  • CAPCOM
  • CAPCOM6: CAPCOM, but 6 buttons
  • SEGA2P
  • NOIR8

Layouts can be set using BUTTON_LAYOUT and BUTTON_LAYOUT_RIGHT in BoardConfig.h, check enums.h

Splash screen addition

• Initial support, works but needs work
• All splashes are hard coded to 7500ms
• No WebUI support
• Added the following splash modes:
  • STATICSPLASH: Display custom bitmap if it exists, GP2040 logo if it does not. Default to show off.
  • CLOSEIN: 'Animated' GP2040 logo
  • CLOSEINCUSTOM: CLOSEIN, but it shows the custom bitmap, if it exists.
  • NOSPLASH: No splash, no delay, all action.
• Adds additional header file called bitmaps.h

Splash modes can be set using SPLASH_MODE in BoardConfig.h.