Ignore casing in denominations

[faboweb]

Summary

When I create a balance [{denom: 'stake', amount: '100'}] in the genesis, gaiad gentx will fail because the user has no STAKE. I propose we ignore casing in the denomination to reduce confusion.
The same goes for transactions where I need to define the denomination. If it is not uppercase the transaction will fail.

Problem Definition

Proposal

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[rigelrozanski]

I agree that it makes sense to prevent the either lowercase or uppercase - I guess making it all caps makes sense as tokens are usually listed as all caps 👍