Promises and Composables instead of R
remove meaningless methods from Composables, move task and merge to Promise, rename few stuff
fix test
remove meaningless compose(T)
Also try out with new lean R
Revert "Also try out with new lean R"

This reverts commit 9758952f5b646ef223fc01b6332a6c62457f0738.
P,C R aliases to Promises, Composables, Reactors