* Add freeze elements to state structs
* Add can_freeze paramter to InitializeMint instruction, and plumb
* Add fixed_supply parameter to InitializeMint
* Convert to SetAuthority instruction
* Add frozen restrictions
* Add FreezeAccount instruction
* Make FreezeAccount into toggle
* Add parameter to make freezing explicit
* Pass mint owner, freeze_authority as parameters
* Rename ToggleFreeze
* Make AuthorityType more explicit
* Rename mint owner => mint_authority
* Add Account::is_frozen method
* C header updates
* s/is_initialized/state for Account
* Minting nit
* Add helpers to clean up AuthorityType packing
* Split FreezeAccount into 2 instructions
* Pass new_authority as parameter not account
* More C header updates
* Use new COption helpers
* Use boolean for toggle fn
Tyera Eulberg
Michael Vines