* MAcro benchamrks * Iterative macro * Tidying it up. * Macro improvements * Bits.. * Last benchmaks. * Repo benchmark macro * Add the possibility of evaluating arbitrary expressions in a benchmaark * Better syntax and docs * Update `BenchmarkParameter` * Add `ignore` to sudo-code in docs * First try of timestamp implementation. * Fix macro docs, remove warnings. * Use macro in balances pallet. * Make some space in frame benchmarking. * Remove _benchmarks_seed variable. * Bump impl_version. Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com> Co-authored-by: Marcio Diaz <marcio@parity.io>