* Adds methods based on instruction_account_index to InstructionContext.
Removes methods which are based on index_in_instruction.
* Adjusts program-runtime.
* Adjusts runtime.
* Adjusts bpf loader.
* Adjusts built-in programs.
* Adjusts program-test and bpf tests.
* Removes the offset InstructionContext::get_number_of_program_accounts() from InstructionAccount::index_in_caller.
* Removes unreachable SyscallError::InvalidLength in orig_data_lens.get().
* Adds transaction_context and instruction_context where invoke_context.get_keyed_accounts() is used.
* Use instruction_context.get_instruction_data() instead of an explicit parameter.
* Removes instruction_data parameter from Executor::execute().
* Removes instruction_data parameter from ProcessInstructionWithContext.
* Use instruction_account_indices, get_sysvar_with_account_check2 and instruction_context.get_signers in vote processor.
* Replaces KeyedAccount by BorrowedAccount in vote processor.
* Removes KeyedAccount from benches in vote processor.
* Unifies SysvarCache filling in the runtime and tests.
Removes new_mock_with_sysvars_and_features()
Removes mock_process_instruction_with_sysvars().
Replaces from_keyed_account() by SysvarCache in vote processor.
* Replaces from_keyed_account() by SysvarCache in BPF loader.