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babaac9305
This performs a deep refactor on the Ledger class and its supporting classes, in preparation for the move to shared_ptr<SLE const> in places where the SLE is immutable and we are currently using shared_ptr<SLE>. Member functions are converted to free functions, the SLECache is an explicit parameter, one line convenience functions are removed to streamline the interface. Some callers are changed to use <SLE const> instead of <SLE> SLECache: * Moved to its own header file RippleState: * Remove unused functions * Store the SLE as const * Simplify callers AccountState: * Remove unused members * Simplify existing members Ledger: * Replace writeBack with insert and update * Remove unused functions * Remove LedgerStateParams * Move getLastFullLedger to Application * add entryCacheI, exists, fetch, erase * Use boost::optional where it makes sense * Make member functions free functions Free functions: * fetch: cache-aware SLE retrieval * forEachItem, forEachItemAfter * (various)