[REQUEST] Make avatar name case insensitive and remove special chars

[canguruhh]

The Avatar name should be case insensitive to avoid confusion and to make it compatible with DNA accounts. The list of allowed special characters should also match the ones from DNA.

[vorapoap]

Is this restriction done on lightwallet or in the MVS core?

[canguruhh]

It should be implemented on the consensus (core). Case sensitivity and the removal of special characters require a soft fork. If we introduce additional characters we would need to do it during the next hardfork.

[canguruhh]

Btw. I closed this issue because its a duplicate of #354