Preload Refactor

[nkolba]

consolidated preloads into 3 different preloads:

• 'view' - this is for views and contains the fdc3 api only
• 'system' - this is for system windows only - such as the window frame, resolver, search results, channel picker and only contains the sail api.
• 'systemView' - this is for special views owned by the sail runtime - such as the home view. This contains both the fdc3 and sail apis.

Adopted the 'sail' namespace for the internal preload api.

Did a bunch of cleanup around the preloads.

Changed renderer and main to work with the new preload and api structure.