Integrates the new upstream commits since c24b36d, adapted to the
cpp20-migration branch's C++/DeviceDescriptor architecture.

New upstream work brought in:
- feat: Trimui Brick Pro support (LoveRetro#766) + fix: trigger LEDs not
  addressable (MAX_LIGHTS 4->5)
- fix: unify color parsing (LoveRetro#774) -- also fixes a hex_str[9] overflow
  and missed alpha in colour presets
- feat: configurable button hint styles (LoveRetro#763)
- Update README license notice; Dependabot GitHub Actions bumps

Brick Pro reconciliation (adopt upstream semantics):
Our branch had its own Brick-family Brick Pro (commit 0a64688). Per
decision, upstream's richer, distinct-device model is adopted and
re-expressed through our DeviceDescriptor architecture:
- is_brickpro is now separate from is_brick (no longer a Brick-family
  member); isBrickModel() helper removed.
- TG5040_BRICK_PRO descriptor carries the new joy_l4=11, joy_r4=12,
  joy_menu_alt=15; L4/R4 trigger buttons wired through descriptor-driven
  JOY_L4/R4 macros and BTN_ID_L4/R4.
- Five-zone LED layout (F1, F2, top bar, joysticks, rear triggers) with
  ledsettings_brickpro.txt and LED_PATH4; own brightness curve and
  displaycal preset via libmsettings.
- platform.h keeps our descriptor macros (not upstream's is_brick||
  is_brickpro ternaries); tg5050 descriptor gets explicit JOY_NA for the
  new fields.

Feature ports kept our C++20 idioms: colorpickermenu/menu keep SurfacePtr
RAII and GFX_getFonts() accessors while taking upstream's semantic fixes;
button-hint input_rects added alongside our encapsulated font accessor.
Duplicate BrickPro enumerator in settings.cpp resolved to upstream's.
Upstream's re-enabled PLAT_pollInput debug LOG_info lines kept commented.

Validated: full clean build on tg5040 (device target, incl. Brick Pro
paths). Brick Pro remains hardware-unverified on both sides.