Document more TODOs as tickets (#1418)

Went through the TODOs, removed a bunch, which are outdated or nothing more than a regular comment, documented a bunch more as actual tickets and made them FIXMEs and unified their structure (`FIXME #TICKETNO DESC` for local tickets, `FIXME: DESC LINK` for external tickets) for easier in-editor support. Further more remove unnecessary remarks and related old code that I noticed in that instance.

substrate/node/cli/src/chain_spec.rs

@@ -58,7 +58,7 @@ fn staging_testnet_config_genesis() -> GenesisConfig {
 
 	GenesisConfig {
 		consensus: Some(ConsensusConfig {
-			code: include_bytes!("../../runtime/wasm/target/wasm32-unknown-unknown/release/node_runtime.compact.wasm").to_vec(),    // TODO change
+			code: include_bytes!("../../runtime/wasm/target/wasm32-unknown-unknown/release/node_runtime.compact.wasm").to_vec(),    // FIXME change once we have #1252
 			authorities: initial_authorities.clone(),
 		}),
 		system: None,

substrate/node/cli/src/service.rs

@@ -46,8 +46,7 @@ construct_simple_protocol! {
 /// Node specific configuration
 pub struct NodeConfig<F: substrate_service::ServiceFactory> {
 	/// grandpa connection to import block
-	// FIXME: rather than putting this on the config, let's have an actual intermediate setup state
-	// https://github.com/paritytech/substrate/issues/1134
+	// FIXME #1134 rather than putting this on the config, let's have an actual intermediate setup state
 	pub grandpa_import_setup: Option<(Arc<grandpa::BlockImportForService<F>>, grandpa::LinkHalfForService<F>)>,
 	inherent_data_providers: InherentDataProviders,
 }
@@ -106,7 +105,7 @@ construct_service_factory! {
 				executor.spawn(grandpa::run_grandpa(
 					grandpa::Config {
 						local_key,
-						// FIXME: make this available through chainspec?
+						// FIXME #1578 make this available through chainspec
 						gossip_duration: Duration::new(4, 0),
 						justification_period: 4096,
 						name: Some(service.config.name.clone())