Add config.go about melonbar HOT 6 CLOSED

I think that'd be the best approach, although it'd be simpler if we change the bar's sync.Map to a slice of blocks like this (which can be placed in config.go), for example:

var blocks = []*Block{
	&Block{
		txt:   "foo",
		w:     10,
		align: 'r',
		xoff:  2,
		bg:    "#445967",
		fg:    "#CCCCCC",
		actions: map[string]func() error{
			"button1": func() error { return foo() },
			"button2": func() error { return bar() },
		},
	},
	&Block{
		txt:   "biz",
		w:     15,
		align: 'a',
		xoff:  0,
		bg:    "#3C4F5B",
		fg:    "#CCCCCC",
		actions: map[string]func() error{
			"button1": func() error { return foo() },
			"button2": func() error { return bar() },
		},
	},
}

which then each can be moved around and put together with a simpler initBlock method and drawn when initializing the bar. foo() and bar() can be declared at the bottom of the file or maybe in a actions.go file.

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it's just under a different name: https://github.com/onodera-punpun/melonbar/blob/master/blocks.go

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There are other such values (see: #1), I'll try creating something like this.

I'm still not sure what the best format would be, would individual blocks (their colors and such) also be configurable ins such a way?

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Furthermore should it be possible to disable entire blocks from this config file? Example, what if someone doesn't use mpd and wants to disable the music bar (#2).

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I've been working on something like this, an example of the "clock block":

	blocks.Set("clock", &Block{
		txt:   "?",
		w:     799,
		align: 'a',
		xoff:  0,
		bg:    xgraphics.BGRA{B: 103, G: 89, R: 68, A: 0xFF},
		fg:    xgraphics.BGRA{B: 204, G: 204, R: 204, A: 0xFF},

		update: func() {
			for {
				block, _ := blocks.Get("clock")
				block.(*Block).txt = time.Now().Format(
					"Monday, January 2th 03:04 PM")

				// Redraw the block.
				bar.redraw <- block.(*Block)

				// Update every 45 seconds.
				time.Sleep(45 * time.Second)
			}
		},
	})

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And there's still no config.go. Reality is cruel.

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