Address validation

Monero addresses are usually of one of the following two types:

1. Standard address 2. Integrated address
 * They consist of 95 characters
 * They start with a
 * The second character can only be a number, or letters  or
 * They consist of 106 characters

Address validation can be done via the monero rpc using the command: validate_address

Ref: https://github.com/monero-project/monero/pull/5141/commits/aCazzoDiCane6932b019ba9f0d72b9ccd7caf743