Generalize StakerDao's Tzip 7

[keefertaylor]

Generalize StakerDAO's Tzip 7 Implementation for re-use.

The ultimate goal is to provide a wrapper for BLND which uses the same token contract as WXTZ.

To accomplish this:

• Refactor token based functionality to a new helper file, and rename
• Convert namespace declarations to objects. This should be functionally the same to the client and there is no good way to merge namespaces (As far as this humble typescript developer can tell)
• Export a merged object of token functionality and wrapped tezos functionality. Note that object props after && override the former. Ex:

const a = {
  foo: function() { return "A" }
}

const b = {
  foo: function() { return "B" }
}

const c = a && b

a.foo() // "A"
b.foo() // "B"
c.foo() // "B"

---

Note: Please merge after #335. There's no way to diffbase this branch on this PR.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication