Desktop integration (#2073)

* Open stash in system tray on Windows/MacOS
* Add desktop notifications
* MacOS Bundling
* Add binary icon

Co-authored-by: WithoutPants <53250216+WithoutPants@users.noreply.github.com>

vendor/github.com/apenwarr/w32/opengl32.go

@@ -0,0 +1,72 @@
+// Copyright 2010-2012 The W32 Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package w32
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+var (
+	modopengl32 = syscall.NewLazyDLL("opengl32.dll")
+
+	procwglCreateContext      = modopengl32.NewProc("wglCreateContext")
+	procwglCreateLayerContext = modopengl32.NewProc("wglCreateLayerContext")
+	procwglDeleteContext      = modopengl32.NewProc("wglDeleteContext")
+	procwglGetProcAddress     = modopengl32.NewProc("wglGetProcAddress")
+	procwglMakeCurrent        = modopengl32.NewProc("wglMakeCurrent")
+	procwglShareLists         = modopengl32.NewProc("wglShareLists")
+)
+
+func WglCreateContext(hdc HDC) HGLRC {
+	ret, _, _ := procwglCreateContext.Call(
+		uintptr(hdc),
+	)
+
+	return HGLRC(ret)
+}
+
+func WglCreateLayerContext(hdc HDC, iLayerPlane int) HGLRC {
+	ret, _, _ := procwglCreateLayerContext.Call(
+		uintptr(hdc),
+		uintptr(iLayerPlane),
+	)
+
+	return HGLRC(ret)
+}
+
+func WglDeleteContext(hglrc HGLRC) bool {
+	ret, _, _ := procwglDeleteContext.Call(
+		uintptr(hglrc),
+	)
+
+	return ret == TRUE
+}
+
+func WglGetProcAddress(szProc string) uintptr {
+	ret, _, _ := procwglGetProcAddress.Call(
+		uintptr(unsafe.Pointer(syscall.StringBytePtr(szProc))),
+	)
+
+	return ret
+}
+
+func WglMakeCurrent(hdc HDC, hglrc HGLRC) bool {
+	ret, _, _ := procwglMakeCurrent.Call(
+		uintptr(hdc),
+		uintptr(hglrc),
+	)
+
+	return ret == TRUE
+}
+
+func WglShareLists(hglrc1, hglrc2 HGLRC) bool {
+	ret, _, _ := procwglShareLists.Call(
+		uintptr(hglrc1),
+		uintptr(hglrc2),
+	)
+
+	return ret == TRUE
+}