Implement runtime version checks in set_code (#4548)

* Implement runtime version checks in `set_code`

Check that the new runtime code given to `set_code` fullfills some
requirements:

- `spec_name` matches
- `spec_version` does not decreases
- `impl_version` does not decreases
- Either `spec_version` and `impl_version` increase

* Make tests almost work

* Some fixes after master merge

* Fix tests

* Add missed file

* Make depedency check happy?

* Remove leftover `sc-executor`

* AHHHHH

* Reset debug stuff

* Remove some 'static

* More 'static

* Some docs

* Update `Cargo.lock`

substrate/primitives/runtime-interface/Cargo.toml

@@ -10,7 +10,6 @@ sp-std = { version = "2.0.0", default-features = false, path = "../std" }
 sp-runtime-interface-proc-macro = { version = "2.0.0", path = "proc-macro" }
 sp-externalities = { version = "0.8.0", optional = true, path = "../externalities" }
 codec = { package = "parity-scale-codec", version = "1.0.6", default-features = false }
-environmental = { version = "1.0.2", optional = true }
 static_assertions = "1.0.0"
 primitive-types = { version = "0.6.1", default-features = false }
 
@@ -29,7 +28,6 @@ std = [
 	"sp-std/std",
 	"codec/std",
 	"sp-externalities",
-	"environmental",
 	"primitive-types/std",
 ]