Fix #616 - update max attrs per line error message, remove white spaces

[michalsnik]

This PR addresses issue #616

[x] Replaces white spaces with new line instead of just adding new line
[x] Improves binding error message
[x] Improves event error message
[x] Improves directive error message

[armano2]

argument can be null when v-bind="$props" and error message is:

Binding "null" should be on a new line.

Suggested change

	propName = prop.key.raw.argument
	propName = prop.key.raw.argument || 'object as props'

see. https://vuejs.org/v2/guide/components-props.html#Passing-the-Properties-of-an-Object

[michalsnik]

Good catch! I forgot about this case. I think it should actually report Directive "bind" should be on a new line

[armano2]

thank you 👍