feat(library/init/meta/tactic): add applyc tactic
feat(library/init/meta/tactic): add applyc tactic

leanprover-community/lean,fpvandoorn/lean,fpvandoorn/lean,digama0/lean,leanprover-community/lean,avigad/lean,digama0/lean,leanprover/lean,johoelzl/lean,leodemoura/lean,rlewis1988/lean,avigad/lean,fpvandoorn/lean,johoelzl/lean,digama0/lean,johoelzl/lean,rlewis1988/lean,Kha/lean,leanprover-community/lean,leodemoura/lean,johoelzl/lean,leanprover-community/lean,dselsam/lean,digama0/lean,leanprover/lean,leanprover/lean,avigad/lean,leodemoura/lean,fpvandoorn/lean,leodemoura/lean,fpvandoorn/lean,leodemoura/lean,leanprover-community/lean,dselsam/lean,johoelzl/lean,Kha/lean,avigad/lean,rlewis1988/lean,leanprover/lean,leanprover/lean,avigad/lean,rlewis1988/lean,Kha/lean,Kha/lean,rlewis1988/lean,rlewis1988/lean,dselsam/lean,avigad/lean,Kha/lean,Kha/lean,leodemoura/lean,dselsam/lean,johoelzl/lean,leanprover/lean,digama0/lean,leanprover-community/lean,dselsam/lean,fpvandoorn/lean,dselsam/lean,digama0/lean