Revert "Define 0chain module"

This reverts commit 314711a.

Define 0chain module

Add sort

Add time.Duration support

msgp: fix dropped test errors

go.mod: fwd: upgrade to 1.1.1

Use the latest bugfix release of philhofer/fwd

msgp/unsafe: bring code in line with unsafe guidelines

At some point the guidelines for unsafe[1] were changed
such that allocating a variable of type 'reflect.StringHeader'
or 'reflect.SliceHeader' is no longer permitted, and 'go vet'
will soon reject code that does so[2].

Change the implementation of UnsafeString to avoid using
an intermediate StringHeader altogether, and deprecate UnsafeBytes,
as the new guidelines seem to indicate it cannot be implemented
safely (escape analysis may not handle it correctly).

[1] https://golang.org/pkg/unsafe/
[2] golang/go#40701

 Adding Power on support to travis

JSON encoder may produce invalid utf-8 when provided invalid utf-8 me…

…ssage pack string.

Fix encoder and add unit test which validates expectation.

all: implement omitempty

Handle the 'omitempty' struct tag similarly to encoding/json

Fixes tinylib#263