Remove eth-lightwallet dependency

[dohaki]

Closes #182

Removal of library and all artefacts related to eth-lightwallet.

[codecov-io]

Codecov Report

Merging #191 into develop will decrease coverage by 4.1%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #191      +/-   ##
===========================================
- Coverage    69.28%   65.18%   -4.11%     
===========================================
  Files           16       15       -1     
  Lines          941      741     -200     
  Branches       140       82      -58     
===========================================
- Hits           652      483     -169     
+ Misses         257      241      -16     
+ Partials        32       17      -15

Flag	Coverage Δ
#integration	38.15% <ø> (-1.05%)	⬇️
#unit	64.91% <ø> (-4.17%)	⬇️

Impacted Files	Coverage Δ
src/TLNetwork.ts	97.61% <ø> (ø)	⬆️
src/User.ts	85.45% <0%> (-0.52%)	⬇️
src/CurrencyNetwork.ts	100% <0%> (ø)	⬆️
src/utils.ts	72.91% <0%> (+0.18%)	⬆️
src/Exchange.ts	25.19% <0%> (+0.95%)	⬆️
src/Trustline.ts	81.69% <0%> (+1.96%)	⬆️
src/Messaging.ts	44.44% <0%> (+4.44%)	⬆️
src/Event.ts	79.31% <0%> (+5.39%)	⬆️
src/wallets/EthersWallet.ts	66.12% <0%> (+6.4%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 9a4abc6...3e02ac4. Read the comment docs.

[berndbohmeier]

LGTM