Godot: Sugar $ produce syntax error if it contains an expression name

[hickop]

Operating system or device - Godot version:
3.0 master Linux

Steps to reproduce:

• Create an object named: var, if, continue, onready ...
• Use $ to select said object, example: $buttons/continue
• In this case editor reported error: Expected end of statement (continue)

[27thLiz]

pinging the GDScript wizards, @bojidar-bg @karroffel

[eon-s]

You can do $"node name", I think is good to discourage the use of keywords for node names, but give a better error description.

[bojidar-bg]

Would be fixed by #8217. Thus, related to #8085.

[ghost]

This seems to be fixed.