[TIMOB-19298] Develop a Titanium Asset Management System

Titanium needs a cross-platform asset management system for managing system controlled resources (launch screens) and application specific assets (image sets, etc). During build time, files are copied to specific destinations and an index is compiled. For iOS, assets would be tranformed into an Asset Catalog and automatically resolve naming conflicts. For Android, certain assets would be copied into the res directory. Not sure about Windows. When a platform goes to resolve an asset, it needs to check the compiled asset index before checking the filesystem.