ADR-016: Add versions to Block and State (#2644)

* types: add Version to Header

* abci: add Version to Header

* state: add Version to State

* node: check software and state protocol versions match

* update changelog

* docs/spec: update for versions

* state: more tests

* remove TODOs

* remove empty test

state/state_test.go

@@ -319,9 +319,11 @@ func TestStateMakeBlock(t *testing.T) {
 	defer tearDown(t)
 
 	proposerAddress := state.Validators.GetProposer().Address
+	stateVersion := state.Version.Consensus
 	block := makeBlock(state, 2)
 
-	// test we set proposer address
+	// test we set some fields
+	assert.Equal(t, stateVersion, block.Version)
 	assert.Equal(t, proposerAddress, block.ProposerAddress)
 }