feat(library/hott) ported Pointed.v
feat(library/hott) port a good portion of FunextVarieties.v
feat(library/hott) port the rest of Funext_Varieties.v
chore(library/hott) cleaned up the proof a bit
feat(library/hott) Ported part of UnivalenceImpliesFunext.v
feat(library/hott) add to trunc.lean: contractible types are equivalent to unit
feat(library/hott) almost completed portin UnivalenceImpliesFunext.v
fix(library/hott) changed pointed.lean to use trunc.lean correctly
chore(library/hott) remove hott.axoims.ua from imports of funext_from_ua.lean
feat(library/algebra/group): add theorems for calculation