Duplicate arugments when a newline preceeds arguments without an explicit command

[jmbeck15]

Consider the following g-code:

G01 X1.0 Y2.0
X3.0 Y4.0

This results in a single G01 command with 4 arguments (X1.0 Y2.0 X3.0 Y4.0) rather than two complete commands.

If the second line has a comment at the end, the file parses properly because comments consider the newline.

[jmbeck15]

I have a pull request coming that adds tests for this, and fixes something else.