remove merged files
rename otfl-font-def.lua -> otfl-fonts-def.lua
update basics-gen.lua
update fonts-def
update fonts-ext
import fresh luatex-fonts.lua and luatex-fonts-merged.lua from Context
otfl-fonts.lua: s/luatex-fonts-merged/otfl-fonts-merged/
preliminarily import l-dir -> otfl-lib-dir.lua to please otfl-font-nms
preliminarily add luaotfload.lua, luaotfload-deferred.lua (move to dtx later)
truly add deferred
temporarily add luatotfload.sty