support folds like tagbar?

[Lonny Wong]

o toggle fold is useful.

Here are tagbar supports:

---------- Folds ----------
+, <kPlus>, zo: Open fold
-, <kMinus>, zc: Close fold
o, za: Toggle fold
*, <kMultiply>, zR: Open all folds
=, zM: Close all folds
zr: Increment fold level by 1
zm: Decrement fold level by 1
zj: Go to next fold
zk: Go to previous fold

[timsu92]

Personally, I use Konfekt/FastFold