Improve text editing support in parameter inputs

[RamiAwar]

Parameter inputs don't allow for natural text editing, ex.

I think this is what #162 was trying to achieve.

Ctrl+Left or Cmd+Left to jump to start of line
Ctrl+Backspace or Cmd+Backspace to clear all (useful when we have a default value we want to clear)
...

gocui seems to support defining a custom editor, we should add support for that. Some boilerplate code from komanda:

ui.Editor = gocui.EditorFunc(simpleEditor)
g.SetManagerFunc(ui.Layout)

func simpleEditor(v *gocui.View, key gocui.Key, ch rune, mod gocui.Modifier) {
	var tab = false
	var inHistroy = false

	switch {
	case key == gocui.KeyTab:
		tab = true
	case ch != 0 && mod == 0:
		v.EditWrite(ch)
	case key == gocui.KeySpace:
		v.EditWrite(' ')
	case key == gocui.KeyBackspace || key == gocui.KeyBackspace2:
		v.EditDelete(true)
	case key == gocui.KeyDelete:
		v.EditDelete(false)
	case key == gocui.KeyInsert:
		v.Overwrite = !v.Overwrite
	case key == gocui.KeyEnter:

		if line := v.ViewBuffer(); len(line) > 0 {
			GetLine(Server.Gui, v)
		} else {
			if c, err := Server.Gui.View(Server.CurrentChannel); err == nil {
				c.Autoscroll = true
			}
		}

		InputHistory.Current()

		// v.EditNewLine()
		// v.Rewind()

	// case key == gocui.MouseMiddle:
	// nextView(Server.Gui, v)
	// case key == gocui.MouseRight:

	case key == gocui.KeyArrowDown:
		inHistroy = true

		if line := InputHistory.Next(); len(line) > 0 {
			v.Clear()
			v.SetCursor(0, 0)
			v.SetOrigin(0, 0)

			fmt.Fprint(v, line)
			v.SetCursor(len(v.Buffer())-1, 0)
		}
	case key == gocui.KeyArrowUp:
		inHistroy = true

		if line := InputHistory.Prev(); len(line) > 0 {
			v.Clear()
			v.SetCursor(0, 0)
			v.SetOrigin(0, 0)

			fmt.Fprint(v, line)
			v.SetCursor(len(v.Buffer())-1, 0)
		}
	case key == gocui.KeyArrowLeft:
		v.MoveCursor(-1, 0, false)
	case key == gocui.KeyArrowRight:

		cx, _ := v.Cursor()
		line := v.ViewBuffer()

		// logger.Logger.Println(len(line), cx)
		// logger.Logger.Println(spew.Sdump(line))

		// if cx == 0 {
		// v.MoveCursor(-1, 0, false)
		if cx < len(line)-1 {
			v.MoveCursor(1, 0, false)
		}

	case key == gocui.KeyCtrlA:
		v.SetCursor(0, 0)
		v.SetOrigin(0, 0)
	case key == gocui.KeyCtrlK:
		v.Clear()
		v.SetCursor(0, 0)
		v.SetOrigin(0, 0)
	case key == gocui.KeyCtrlE:
		v.SetCursor(len(v.Buffer())-1, 0)
	case key == gocui.KeyCtrlLsqBracket:
		// logger.Logger.Println("word...")
	}

	if !inHistroy {
		// InputHistory.Current()
	}

	if !tab {
		// logger.Logger.Print("CALL\n")

		inCacheTab = false
		cacheTabSearch = ""
		cacheTabResults = []string{}
	}
}