Fix parameter naming inconsistencies between .h and .cpp files

Fix parameter naming inconsistencies between .h and .cpp files

Inconsistencies prior to this commit:

* serializeFlags vs serialFlags
src/core_io.h:std::string EncodeHexTx(const CTransaction& tx, const int serializeFlags = 0);
src/core_write.cpp:std::string EncodeHexTx(const CTransaction& tx, const int serialFlags)

* statusOut vs outStatus
src/rpc/server.h:bool RPCIsInWarmup(std::string *statusOut);
src/rpc/server.cpp:bool RPCIsInWarmup(std::string *outStatus)

* hashesToUpdate vs vHashesToUpdate
src/txmempool.h:    void UpdateTransactionsFromBlock(const std::vector<uint256> &hashesToUpdate);
src/txmempool.cpp:void CTxMemPool::UpdateTransactionsFromBlock(const std::vector<uint256> &vHashesToUpdate)

* nPruneUpToHeight vs nManualPruneHeight
src/validation.h:void PruneBlockFilesManual(int nPruneUpToHeight);
src/validation.cpp:void PruneBlockFilesManual(int nManualPruneHeight);