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Member functions and free functions on Ledger and LedgerEntrySet are rewritten in terms of new abstract interfaces `BasicView` and `View`, representing the set of non-decomposable primitives necessary to read and write state map items in a ledger, and to overlay a discardable view onto a Ledger that can calculate metadata during transaction processing. const-correctness is enforced through the parameter and return types. The MetaView now supports multi-level stacking: A MetaView can be stacked on top of either a Ledger or another MetaView, up to any number of levels. The getSLEi member function is removed. The CachedView wrapper replaces it, wrapping a View such that any function called with a CachedView will go through the SLECache. * Add BasicView, View, CachedView * Rename LedgerEntrySet to MetaView * Factor out free functions * Consolidate free functions in ViewAPI * Remove unused class members and free functions