fixed tests
Make CustomTemplateCallback immutable
(cherry picked from commit 8d09421)

[r=enDal]
WEB-11278 Bad performance expanding emmet
(cherry picked from commit e672f58)

[r=enDal]
WEB-11278 Bad performance expanding emmet
(cherry picked from commit 9210149)
WEB-11877 Emmet transforms escaped $ to 0 (zero)
(cherry picked from commit 47438f5)

[r=enDal]
fix cherry-pick