Rename Palette to FRAME (#4182)

* palette -> frame

* PALETTE, Palette -> FRAME

* Move folder pallete -> frame

* Update docs/Structure.adoc

Co-Authored-By: Benjamin Kampmann <ben.kampmann@googlemail.com>

* Update docs/README.adoc

Co-Authored-By: Benjamin Kampmann <ben.kampmann@googlemail.com>

* Update README.adoc

substrate/frame/support/test/tests/system.rs

@@ -0,0 +1,64 @@
+use support::codec::{Encode, Decode, EncodeLike};
+
+pub trait Trait: 'static + Eq + Clone {
+	type Origin: Into<Result<RawOrigin<Self::AccountId>, Self::Origin>>
+		+ From<RawOrigin<Self::AccountId>>;
+
+	type BlockNumber: Decode + Encode + EncodeLike + Clone + Default;
+	type Hash;
+	type AccountId: Encode + EncodeLike + Decode;
+	type Event: From<Event>;
+}
+
+support::decl_module! {
+	pub struct Module<T: Trait> for enum Call where origin: T::Origin {
+	}
+}
+
+impl<T: Trait> Module<T> {
+	pub fn deposit_event(_event: impl Into<T::Event>) {
+	}
+}
+
+support::decl_event!(
+	pub enum Event {
+		ExtrinsicSuccess,
+		ExtrinsicFailed,
+	}
+);
+
+support::decl_error! {
+	pub enum Error {
+		/// Test error documentation
+		TestError,
+		/// Error documentation
+		/// with multiple lines
+		AnotherError
+	}
+}
+
+/// Origin for the system module.
+#[derive(PartialEq, Eq, Clone, sr_primitives::RuntimeDebug)]
+pub enum RawOrigin<AccountId> {
+	Root,
+	Signed(AccountId),
+	None,
+}
+
+impl<AccountId> From<Option<AccountId>> for RawOrigin<AccountId> {
+	fn from(s: Option<AccountId>) -> RawOrigin<AccountId> {
+		match s {
+			Some(who) => RawOrigin::Signed(who),
+			None => RawOrigin::None,
+		}
+	}
+}
+
+pub type Origin<T> = RawOrigin<<T as Trait>::AccountId>;
+
+#[allow(dead_code)]
+pub fn ensure_root<OuterOrigin, AccountId>(o: OuterOrigin) -> Result<(), &'static str>
+	where OuterOrigin: Into<Result<RawOrigin<AccountId>, OuterOrigin>>
+{
+	o.into().map(|_| ()).map_err(|_| "bad origin: expected to be a root origin")
+}