New Sublime Text Layouts (One Left and Two Right & Two Left and One Right) via Menu

Main.sublime-menu

[
	{
		"caption": "View",
		"mnemonic": "V",
		"id": "view",
		"children":
		[
			{
				"caption": "Layout",
				"mnemonic": "L",
				"id": "layout",
				"children":
				[
					{
						"caption": "One Left and Two Right",
						"command": "set_layout",
						"args":
						{
							"cols": [0.0, 0.5, 1.0],
							"rows": [0.0, 0.5, 1.0],
							"cells":
							[
								[0, 0, 1, 2],
								[1, 0, 2, 1],
								[1, 1, 2, 2]
							]
						}
					},
					{
						"caption": "Two Left and One Right",
						"command": "set_layout",
						"args":
						{
							"cols": [0.0, 0.5, 1.0],
							"rows": [0.0, 0.5, 1.0],
							"cells":
							[
								[0, 0, 1, 1],
								[0, 1, 1, 2],
								[1, 0, 2, 2]
							]
						}
					}
				]
			}
		]
	}
]