Update schemas, use schemas for validation, and switch to is-my-json-valid

src/api/common/index.js

@@ -5,7 +5,6 @@ module.exports = {
   core: require('./core'),
   constants: require('./constants'),
   errors: require('./errors'),
-  schemaValidator: require('./schema-validator'),
   validate: require('./validate'),
   server: require('./server'),
   dropsToXrp: utils.dropsToXrp,