Add LabelPoint support

[tresf]

Quoting the programming guide: PQ6522.pdf

The thermal printer family features a simple yet powerful command language, Labelpoint II
(LP II). This allows the printers to be controlled from most computers. Most common bar code
symbologies are available. Text and bar codes can be printed in all four directions
simultaneously. Counters for consecutive numbering are available and an integral real-time
clock allows labels to be time-stamped at print time.
Labelpoint II uses only printable ASCII characters to allow commands to be easily
manipulated in the host computer. This also avoids problems with control characters that some
computer systems reserve for internal use.

!C
!Y24 60
!Y35 10
!Y42 1
!F T N 100 100 L 14 0 94030 "TESTLABEL"
!F T N 200 100 L 10 0 94021 "PRICE: 65.00"
!F T N 250 100 L 10 0 94021 "SIZE: 42"
!F C N 450 100 L 150 2 41 "65.00"
!F B N 120 90 L 80 240
!P