Allow passing in actions icon for menu

[danrabyhive]

Is your feature request related to a problem? Please describe.
When using a icon font other than material, it is impossible to fix the more actions button.

Describe the solution you'd like
Add property to allow this icon to be set.

Describe alternatives you've considered
Right now I can't think of a way to fix this without forking and forcing the new version in the build.

Edit: I'm going to use a custom header.

Additional context
The icon is hard-coded in the render function:

quasar-ui-qwindow/ui/src/components/QWindow.js

Lines 1571 to 1587 in d4923d8

	__renderMoreButton (h, menuData) {
	if (this.noMenu === true) {
	return ''
	}
	return h(QBtn, {
	staticClass: 'q-window__titlebar--actions',
	props: {
	flat: true,
	round: true,
	dense: true,
	icon: 'more_vert'
	}
	}, [
	this.__renderMoreMenu(h, menuData)
	])
	},

[hawkeye64]

Good catch. I'll look into a fix for this on the weekend.

[nucle]

I will also implement this feature in the new version of qwindow 2