Early functionality modules

0. tests for event replay
   Tests are now included for the event replay features. This includes many fixes on top of
   the last commit as well as some tweaks to config module values.
1. activity module
   An activity module is created to track the useractive events and provide a counter for them.
   It also encapsulates logic to discard old useractive events.
2. web module
   A web module is created. This module serves a static webpage showing runtime information.
   Currently it only shows a snapshot of the user activity data. It is my intention that it
   eventually also shows an audit log, known users and channels, uptime, and more. Future work
   will also be needed in order to use HTML templating so that it doesn't look so... basic.
   Live updates to the information may also be desired.

Signed-off-by: Ava Affine <ava@sunnypup.io>

main.go

@@ -4,10 +4,12 @@ import (
 	"flag"
 	"log"
 
+	"gitlab.com/whom/bingobot/internal/activity"
 	"gitlab.com/whom/bingobot/internal/config"
 	"gitlab.com/whom/bingobot/internal/discord"
 	"gitlab.com/whom/bingobot/internal/logging"
 	"gitlab.com/whom/bingobot/internal/state"
+	"gitlab.com/whom/bingobot/internal/web"
 )
 
 var (
@@ -33,15 +35,22 @@ func main() {
 		log.Fatalf("couldn't initialize state engine: %s", err.Error())
 	}
 
-	// TODO: start modules HERE and not elsewhere
-	err = startBot()
+	if err := activity.Start(); err != nil {
+		// TODO: handle gracefully and continue?
+		log.Fatalf("failed to start activity module: %s", err.Error())
+	}
 
+	if err := web.Start(); err != nil {
+		log.Fatalf("failed to start local web server: %s", err.Error())
+	}
+
+	// start this LAST
 	if err := state.Start(); err != nil {
-		log.Fatal("failed to start state machine: %s", err.Error())
+		log.Fatalf("failed to start state machine: %s", err.Error())
 	}
 	defer state.Teardown()
 
-	if err != nil {
+	if err := startBot(); err != nil {
 		log.Fatal(err)
 	}
 }