🦺 [Tech Debt] Migration to Full Segwit/bech32 compliance

[kcw-grunt]

Goal

Litewallet (Android and iOS clients) shall have full seg wit compliance with backwards compatibility to full-header M, L addresses

Background

Bech32 is a address format that more efficiently the space in the Litecoin block header where the checksum of the header is used reducing space in the header. This change is very popular with over 80% of the network using it (segwit)

In general, any efficiencies in the Litecoin blockchain should always be taken advantage of to allow more transactions per block making throughput higher.

Client Status

State	Android	iOS
Accepts L, M Addresses	√	√
Accepts bech32 (1ltc) addresses	√	√
Sends to bech32 (1ltc) addresses	X	√
Generates bech32 (1ltc) addresses	X	X

Tasks

• Android accepts and sends bech32 addresses
• iOS sets bech32 as default address format
• Android sets bech32 as default address format

[kcw-grunt]

@losh11 @mosadialiou
cc: @coblee

Can you guys tale a look at this and let me know if anything is missing?