XRouter calls should be case-insensitive

[shrnkld]

Scenario:

Sending some XRouter commands via wallet console requires the parameters to be uppercase eg:
xrgetblockcount ltc fails, but xrgetblockcount LTC works as expected.

Given that all other console commands are case-insensitive, XRouter cmds should also be.

Env: Core wallet v4.3.3 public

To do:

• check for XRouter cmds that are case-sensitive and change to case-insensitive ie: xrgetblockcount ltc or xrGetBlockCount LTC should both work.

QA:

• all XRouter calls should work as expected despite the type case used.