Mint/Burn fantoken, change denom to symbol

[angelorc]

When you issue a new fantoken, you need to specify the symbol. In my example I issued the symbol angelo it mean that in the state it's stored as uangelo.

bitsongd tx fantoken issue --name Angelo --symbol angelo --max-supply 1000 --issue-fee 1000000

If you want to mint a new fantoken, you must specify the symbol, the current command is accepting the denom and it should be changed with symbol

From: bitsongd tx fantoken mint uangelo --recipient $(bitsongd keys show validator -a) --amount 1

To: bitsongd tx fantoken mint angelo --recipient $(bitsongd keys show validator -a) --amount 1

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From: bitsongd tx fantoken burn uangelo --amount 1

To: bitsongd tx fantoken burn angelo --amount 1

[ssdbkey]

This is conflict with https://github.com/bitsongofficial/go-bitsong/issues/56 We discussed to use denom, not symbol here.

[angelorc]

Better to write somewhere (for example to btsg.dev) the difference between denom and symbol