Downscaled leaderscene and fixed issue with Royal Host not working correctly

--Updated for Rising Tide. Vanilla version available here: https://drive.google.com/drive/folders/0B2KfUlRX1owlWXJOWms5aHRQY2s?usp=sharing
--Updated artwork for better quality, thanks to Jan.
--The CDC's trait is now: Scaling Diplomatic Capital and Culture in cities with a Naval garrison. This was changed to better reflect the updated lore, as well as the nature of the Royal Naval Commonwealth as a symbol of the monarchy.
--The CDC's Trade Agreements are:
---Two-Power Standard: Increased Naval Production.
---Royal Host: Bonus Culture in cities with a garrison.
--North Sea Alliance's Hydroengineering Corps TA now increases Science based on a percentage of Energy.
--The lore has been slightly adjusted to accomodate the existence of the North Sea Alliance. In essence, the NSA is now a non-government body centred on the coastal areas of the North Sea, in particular, London, Copenhagen, and the Netherlands. So, whilst the governments of the UK and Denmark turned northwards, this network of businessmen, engineers, scientists etc. from across the destroyed cities of North Sea countries propped up an NGO focused on creating the ARKs - the only real departure from the canon lore is their NGO status.