Rename PAINT to PALETTE (#4161)

* /paint to /palette

* rename paint to palette

* rename the modules in palette to be pallets

* update Structure.adoc

* bump impl

* fix CI directory

* Update docs/Structure.adoc

Co-Authored-By: Benjamin Kampmann <ben@gnunicorn.org>

substrate/palette/system/rpc/runtime-api/Cargo.toml

@@ -0,0 +1,16 @@
+[package]
+name = "palette-system-rpc-runtime-api"
+version = "2.0.0"
+authors = ["Parity Technologies <admin@parity.io>"]
+edition = "2018"
+
+[dependencies]
+sr-api = { path = "../../../../primitives/sr-api", default-features = false }
+codec = { package = "parity-scale-codec", version = "1.0.0", default-features = false  }
+
+[features]
+default = ["std"]
+std = [
+	"sr-api/std",
+	"codec/std",
+]