all: rename the gioui.org/ui module to gioui.org

The "ui" is redundant and stutters.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

app/sigpipe_darwin.go

@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+package app
+
+import (
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+func init() {
+	// Work around golang.org/issue/33384
+	signal.Notify(make(chan os.Signal), syscall.SIGPIPE)
+}