Option for making copier:"must" or copier:"must,nopanic" a default behavior.

[josephbuchma]

Describe the feature

To add MustByDefault bool and NoPanicByDefualt bool to the copier.Option struct. Setting both to true
will have same effect as adding copier:"must,nopanic" to every field in the src struct.

Motivation

Not having to specify copier:"must" or copier:"must,nopanic" to every field in the struct when it's a desired default.

Related Issues

[tedkornish]

Seconding this request. It would give significant security as structs change over time.