refactor(go): Move everything from go4k to root package sointu

cmd/sointu-tracker/main.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"fmt"
+	"gioui.org/app"
+	"gioui.org/unit"
+	"github.com/vsariola/sointu/audio/oto"
+	"github.com/vsariola/sointu/tracker"
+	"os"
+)
+
+func main() {
+	plr, err := oto.NewPlayer()
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	defer plr.Close()
+	go func() {
+		w := app.NewWindow(
+			app.Size(unit.Dp(800), unit.Dp(600)),
+			app.Title("Sointu Tracker"),
+		)
+		t := tracker.New(plr)
+		defer t.Close()
+		if err := t.Run(w); err != nil {
+			fmt.Println(err)
+			os.Exit(1)
+		}
+		os.Exit(0)
+	}()
+	app.Main()
+}