Bugfixes and consistency tweaksa

[NiclasScheiber]

• Removed and merged class Country into CodeListElement for consistency and added features
• Removed cityName property as CodeListElement already features the name
• Removed regionName property as CodeListElement already features the name
• Removed addressCodeType property as CodeListElement already includes the reference to the address code system
• Added property regulatedEntityAcceptor to comply with eCSD requirements
• Re-added property regulatedEntityIdentifier that was mistakenly removed
• Removed properties originCurrency and destinationCurrencyCode as currencies are included within CurrencyValue
• Removed property total as it is redundant and lead to inconsistent line items
• Changed regionCode from string to CodeListElement
• Renamed property securityDeclaration to securityDeclarations
• Lifted cardinality restrictions from piece to securityDeclaration (1:n)
• Changed Range of rateCharge from Value to CurrencyValue
• Changed rcp from string to CodeListElement
• Changed destinationCharges from double to CurrencyValue