Update cursorWordPart commands

[adzenith]

Update subword keybindings to match Sublime Text's:

Mac:

	{ "keys": ["ctrl+alt+left"], "command": "move", "args": {"by": "subwords", "forward": false} },
	{ "keys": ["ctrl+alt+right"], "command": "move", "args": {"by": "subword_ends", "forward": true} },
	{ "keys": ["ctrl+alt+shift+left"], "command": "move", "args": {"by": "subwords", "forward": false, "extend": true} },
	{ "keys": ["ctrl+alt+shift+right"], "command": "move", "args": {"by": "subword_ends", "forward": true, "extend": true} },

	{ "keys": ["ctrl+left"], "command": "move", "args": {"by": "subwords", "forward": false} },
	{ "keys": ["ctrl+right"], "command": "move", "args": {"by": "subword_ends", "forward": true} },
	{ "keys": ["ctrl+shift+left"], "command": "move", "args": {"by": "subwords", "forward": false, "extend": true} },
	{ "keys": ["ctrl+shift+right"], "command": "move", "args": {"by": "subword_ends", "forward": true, "extend": true} },

Windows:

	{ "keys": ["alt+left"], "command": "move", "args": {"by": "subwords", "forward": false} },
	{ "keys": ["alt+right"], "command": "move", "args": {"by": "subword_ends", "forward": true} },
	{ "keys": ["alt+shift+left"], "command": "move", "args": {"by": "subwords", "forward": false, "extend": true} },
	{ "keys": ["alt+shift+right"], "command": "move", "args": {"by": "subword_ends", "forward": true, "extend": true} },

Linux:

	{ "keys": ["alt+left"], "command": "move", "args": {"by": "subwords", "forward": false} },
	{ "keys": ["alt+right"], "command": "move", "args": {"by": "subword_ends", "forward": true} },
	{ "keys": ["alt+shift+left"], "command": "move", "args": {"by": "subwords", "forward": false, "extend": true} },
	{ "keys": ["alt+shift+right"], "command": "move", "args": {"by": "subword_ends", "forward": true, "extend": true} },

[msftclas]

All CLA requirements met.