Enable renaming of tokens on EVM

[Bushstar]

Summary

• Supports renaming of tokens EVM side after a hard fork. This PR also puts in some groundwork to enable stock split on EVM by passing the BlockContext to ProcessDeFiEvents for CreateToken and UpdateToken inside of ProcessTokenSplits. For now a dummy context is passed in, but the BlockContext is available.
• Updates CreateToken and UpdateToken to take a BlockContext reference, CreateToken previously had a BlockContext as a pointer which is less desirable.
• A previous update prevented tokens from being created with invalid characters in their symbol, however this protection was not included in token updates. This PR prevents using invalid chars when updating a token or loan token symbol.

Implications

• Storage

  • Database reindex required
  • Database reindex optional
  • Database reindex not required
  • None

• Consensus

  • Network upgrade required
  • Includes backward compatible changes
  • Includes consensus workarounds
  • Includes consensus refactors
  • None