feat(cli): Re-engineer CLIs, split play & compile

Play depends on bridge and compile on compiler package. Before, the compiler depended on bridge, but we could not use the compiler to build the library, as the bridge depends on the library. Also, play can now start having slightly more options e.g. wav out etc.

cmd/sointu-track/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()
+}