Rebase over SDCC r11930#16

Draft

pixelherodev wants to merge 6 commits intomasterfrom

Commits on Dec 20, 2020

Add initial C95 support
Noam Preil
committed
Add unicode support
Noam Preil
committed
Bump to 4.1.0
Noam Preil
committed
Add a warning when doubles are used
Noam Preil
committed
fin
Noam Preil
committed
Probably fix
Noam Preil
committed