Vivox voice services

- Small update to prevent possibility of a 'hang' situation if a parcel
does not allow voice
SystemEstateService / UserAccounting

- Added to allow for user configuration of the system Estate owner name
and the the system estate name
- updated where necessary to reference ISystemEstateService instead of
hardcoded Constants
- Added [EstateService] configuration sections to StandaloneCommon and
(grid) Services ini files
- Moved system estate user check/creation and commands processing from
UserAccountService into SystemEstateService
- Added 'reset system estate' to provide for configuration changes

UserAccounting
- Reworked the load / save users commands
DisplayName issues #58

Loginservices
- send the user DisplayName (if set) in the welcome message
MySql.ini files
- Add 'Charset=utf8' to the connection string to allow for unicode data
in strings.

(Operation is correct using SQLite)