+ Rather than waiting for the first "interactive" major mode to be
visited to activate yas-minor-mode, we wait until the first time the
user invokes a snippet command to activate yas-global-mode.
+ yas-reload-all is one of the bottlenecks when loading a file for the
first time. Deferring it further should help with this.
+ yas-global-mode reaches more major modes than our former list of
hooks (fixes#5140).
Closes#5140
60b595321e