* mobile: don't retain transient []byte in CallMsg.SetData
Go mobile doesn't copy []byte parameters, for performance and to allow
writes to the byte array be reflected in the native byte array.
Unfortunately, that means []byte arguments are only valid during the
call it is being passed into.
CallMsg.SetData retains such a byte array. Copy it instead
Fixes#14675
* mobile: copy all []byte arguments from gomobile
To avoid subtle errors when accidentially retaining an otherwise
transient byte slice coming from gomobile, copy all byte slices before
use.
* mobile: replace copySlice with common.CopyBytes
* build: modify the iOS namespace to iGeth (gomobile limitation)
* mobile: assign names to return types for ObjC wrapper
* mobile: use more expanded names for iOS/Swift API
