Add logs to Logs page (#151)

* Add websocket connection

* Add logs to the log page

* Make debug color more readable

* Remove TODO from front page

* Put all log entries in latest first order

* Add filtering of log entries by level

* Limit log entries and throttle updates

* Fix logger not throttling broadcasts

* Remove now unnecessary UI-side log throttling

* Filter incoming logs by log level

* Make log view more terminal-like

graphql/documents/data/log.graphql

@@ -0,0 +1,5 @@
+fragment LogEntryData on LogEntry {
+  time
+  level
+  message
+}

graphql/documents/queries/misc.graphql

@@ -54,6 +54,11 @@ query Stats {
   }
 }
 
+query Logs {
+  logs {
+    ...LogEntryData
+  }
+}
 query Version {
   version {
     hash,

graphql/documents/subscriptions.graphql

@@ -1,3 +1,9 @@
 subscription MetadataUpdate {
   metadataUpdate
+}
+
+subscription LoggingSubscribe {
+  loggingSubscribe {
+    ...LogEntryData
+  }
 }