* Add MgmKey::set_default method
This wipes any metadata related to derived and PIN-protected management
keys, returning the management key to its default state.
* Transaction::set_mgm_key: Take touch requirement as bool
The Option<u8> was inherited from the original C code's usage of an
unsigned char. We don't need that flexibility, because only two cases
are supported.
* Replace MgmKey::set with MgmKey::set_manual
MgmKey::set_default is now implemented as a wrapper around
MgmKey::set_manual, as they both require clearing metadata related to
derived and PIN-protected management keys.
str4d
18e3636161