feat: add light node upgrade top up methods (#372)

* feat: add top up

* chore: remove console.log

* build: add pseudo-missing dependency

* feat: add missing top up components

* fix: crypto route

* feat(wip): add gift wallet logic

* fix: fix gift wallet flows

* feat: simplify flow without fund step

* feat: add loading screens

* fix: remove alert

* fix: prepend http if needed

* fix: fix bug that was reintroduced with merge

* refactor: rename minusEther to minusBaseUnits

* fix: remove unused setStartedAt

* build: remove unused dependency

src/models/BzzToken.ts

@@ -0,0 +1,8 @@
+import { BigNumber } from 'bignumber.js'
+import { Token } from './Token'
+
+export class BzzToken extends Token {
+  constructor(amount: BigNumber | string | BigInt) {
+    super(amount, 16)
+  }
+}