Run modernize to rewrite some older go constructs to newer ones

Mostly using slice.Sort, using min/max, slices.Concat, range of int and
fmt.Appendf for byte slices instead of strings.

moxio/base64writer.go

@@ -39,10 +39,7 @@ type lineWrapper struct {
 func (lw *lineWrapper) Write(buf []byte) (int, error) {
 	wrote := 0
 	for len(buf) > 0 {
-		n := 78 - lw.n
-		if n > len(buf) {
-			n = len(buf)
-		}
+		n := min(78-lw.n, len(buf))
 		nn, err := lw.w.Write(buf[:n])
 		if nn > 0 {
 			wrote += nn

moxio/bufpool.go

@@ -54,7 +54,7 @@ func (b *Bufpool) put(log mlog.Log, buf []byte, n int) {
 		return
 	}
 
-	for i := 0; i < n; i++ {
+	for i := range n {
 		buf[i] = 0
 	}
 	select {

moxio/bufpool_test.go

@@ -15,7 +15,7 @@ func TestBufpool(t *testing.T) {
 	bp := NewBufpool(1, 8)
 	a := bp.get()
 	b := bp.get()
-	for i := 0; i < len(a); i++ {
+	for i := range a {
 		a[i] = 1
 	}
 	log := mlog.New("moxio", nil)

moxio/workq.go

@@ -50,7 +50,7 @@ func NewWorkQueue[T, R any](procs, size int, preparer func(in, out chan Work[T,
 	}
 
 	wq.wg.Add(procs)
-	for i := 0; i < procs; i++ {
+	for range procs {
 		go func() {
 			defer wq.wg.Done()
 			preparer(wq.work, wq.done)