Proposal: log binary data for Solidity

Rename "Program return data: " to "Program return: " since "data" is
redundant.

(cherry picked from commit b89177c8de)

Conflicts:
	programs/bpf_loader/src/syscalls.rs
	sdk/bpf/c/inc/sol/log.h
	sdk/program/Cargo.toml
	sdk/src/feature_set.rs
	sdk/src/process_instruction.rs

sdk/bpf/c/inc/solana_sdk.h

@@ -619,6 +619,11 @@ static uint64_t sol_invoke(
   );
 }
 
+/**
+ * Print the base64 representation of some arrays.
+ */
+void sol_log_data(SolBytes *fields, uint64_t fields_len);
+
 /**@}*/
 
 /**