Log Message:
tex-luaotfload{,-doc}: update to 2.94

This version syncs the files with the ConTeXt files from2018/12/19. It
extends the mode key to allow the use of more fontloaders. It is the last
version which can be used with luatex 1.07. Future versions will need 1.09
and will be available only at the github site until texlive 2018 is freezed.