* clean up toml files * update the parity ethereum toolchain docs * update contribution guide and issue templates * update desktop and service files * build clib examples with 8 threads * update header templates * replace parity technologies with parity ethereum logo
util/mem
* Add `util/mem` to zero out memory on drop. * Remove nonsense. * Remove `Into` impls for `Memzero`. * Update ethereum-types and remove H256Mut.