BIM,CAM: Resolve Python invalid escape sequence warnings

src/Mod/CAM/CAMTests/TestPathPost.py

@@ -40,7 +40,7 @@ Path.Log.setLevel(Path.Log.Level.INFO, PathCommand.LOG_MODULE)
 
 
 class TestFileNameGenerator(unittest.TestCase):
-    """
+    r"""
     String substitution allows the following:
     %D ... directory of the active document
     %d ... name of the active document (with extension)

src/Mod/CAM/Path/Post/scripts/gcode_pre.py

@@ -191,7 +191,7 @@ def _identifygcodeByToolNumberList(filename):
     p = re.compile(r"[mM]+?\s?0?6\s?T\d*\s")
 
     # split the gcode on tool changes
-    paths = re.split("([mM]+?\s?0?6\s?T\d*\s)", gcode)
+    paths = re.split(r"([mM]+?\s?0?6\s?T\d*\s)", gcode)
 
     # iterate the gcode sections and add customs for each
     toolnumber = 0