The great refactor (#325)

* Move pallets to pallets folder and rename them

* Move genesis file to service

* Rename primitives to primitives-core

* Delete cumulus-runtime

* Move stuff to client folder and rename

cumulus/pallets/parachain-system/src/validate_block/mod.rs

@@ -0,0 +1,85 @@
+// Copyright 2019 Parity Technologies (UK) Ltd.
+// This file is part of Substrate.
+
+// Substrate is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Substrate is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Cumulus. If not, see <http://www.gnu.org/licenses/>.
+
+//! A module that enables a runtime to work as parachain.
+
+#[cfg(not(feature = "std"))]
+#[doc(hidden)]
+pub mod implementation;
+#[cfg(test)]
+mod tests;
+
+#[cfg(not(feature = "std"))]
+#[doc(hidden)]
+pub use polkadot_parachain;
+
+/// Register the `validate_block` function that is used by parachains to validate blocks on a
+/// validator.
+///
+/// Does *nothing* when `std` feature is enabled.
+///
+/// Expects as parameters the block and the block executor.
+///
+/// # Example
+///
+/// ```
+///     struct Block;
+///     struct BlockExecutor;
+///
+///     cumulus_pallet_parachain_system::register_validate_block!(Block, BlockExecutor);
+///
+/// # fn main() {}
+/// ```
+#[macro_export]
+macro_rules! register_validate_block {
+	($block:ty, $block_executor:ty) => {
+		$crate::register_validate_block_impl!($block, $block_executor);
+	};
+}
+
+/// The actual implementation of `register_validate_block` for `no_std`.
+#[cfg(not(feature = "std"))]
+#[doc(hidden)]
+#[macro_export]
+macro_rules! register_validate_block_impl {
+	($block:ty, $block_executor:ty) => {
+		#[doc(hidden)]
+		mod parachain_validate_block {
+			use super::*;
+
+			#[no_mangle]
+			unsafe fn validate_block(arguments: *const u8, arguments_len: usize) -> u64 {
+				let params =
+					$crate::validate_block::polkadot_parachain::load_params(arguments, arguments_len);
+
+				let res = $crate::validate_block::implementation::validate_block::<
+					$block,
+					$block_executor,
+				>(params);
+
+				$crate::validate_block::polkadot_parachain::write_result(&res)
+			}
+		}
+	};
+}
+
+/// The actual implementation of `register_validate_block` for `std`.
+#[cfg(feature = "std")]
+#[doc(hidden)]
+#[macro_export]
+macro_rules! register_validate_block_impl {
+	($block:ty, $block_executor:ty) => {};
+}