Update to GCC 14

[mark9064]

Rebase of #1512

The linker warnings still exist

[github-actions]

Build size and comparison to main:

Section	Size	Difference
text	382428B	0B
data	944B	0B
bss	22632B	0B

Run in InfiniEmu

[mark9064]

The size difference definitely isn't zero though, I guess the CI job isn't built to handle toolchain changes

[mark9064]

14.2 (I haven't downloaded 14.3 yet but should be very similar)

Memory region         Used Size  Region Size  %age Used
           FLASH:      379616 B     474632 B     79.98%
     SPARE_SPACE:           0 B        12 KB      0.00%
             RAM:       23868 B        64 KB     36.42%

10.3

Memory region         Used Size  Region Size  %age Used
           FLASH:      382428 B     474632 B     80.57%
     SPARE_SPACE:          0 GB        12 KB      0.00%
             RAM:       23576 B        64 KB     35.97%