Grbl: Change to CRLF line ending for better compatibility

Grbl accepts any kind of line ending.
The FludNC fork of Grbl only accepts CRLF and LF.

t-oster/VisiCut#734 (comment)

src/main/java/de/thomas_oster/liblasercut/drivers/Grbl.java

@@ -36,7 +36,11 @@ public class Grbl extends GenericGcodeDriver
   public Grbl()
   {
     //set some grbl-specific defaults
-    setLineend("CR");
+    // Line ending
+    // Grbl accepts CR, CRLF and LF.
+    // FluidNC accepts CRLF and LF.
+    // So we use CRLF for best compatibility.
+    setLineend("CRLF");
     setIdentificationLine("Grbl");
     // Grbl uses "ok" flow control
     setWaitForOKafterEachLine(true);

test-output/de.thomas_oster.liblasercut.drivers.Grbl.out

@@ -1 +1,76 @@
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