Fix some escaping issues on Windows

Author: silvanocerza

Diff for: cli/compile/compile.go

@@ -62,9 +62,9 @@ func NewCommand() *cobra.Command {
 		Long:  "Compiles Arduino sketches.",
 		Example: "" +
 			"  " + os.Args[0] + " compile -b arduino:avr:uno /home/user/Arduino/MySketch\n" +
-			"  " + os.Args[0] + " compile -b arduino:avr:uno --build-property='build.extra_flags=\"-DMY_DEFINE=\"hello world\"\"' /home/user/Arduino/MySketch\n" +
-			"  " + os.Args[0] + " compile -b arduino:avr:uno --build-property='build.extra_flags=-DPIN=2 \"-DMY_DEFINE=\"hello world\"\"' /home/user/Arduino/MySketch\n" +
-			"  " + os.Args[0] + " compile -b arduino:avr:uno --build-property=build.extra_flags=-DPIN=2 --build-property='compiler.cpp.extra_flags=\"-DSSID=\"hello world\"\"'-DMY_DEFINE=\"hello world\"' /home/user/Arduino/MySketch\n",
+			"  " + os.Args[0] + " compile -b arduino:avr:uno --build-property=\"build.extra_flags=\\\"-DMY_DEFINE=\\\"hello world\\\"\\\"\" /home/user/Arduino/MySketch\n" +
+			"  " + os.Args[0] + " compile -b arduino:avr:uno --build-property=\"build.extra_flags=-DPIN=2 \\\"-DMY_DEFINE=\\\"hello world\\\"\\\"\" /home/user/Arduino/MySketch\n" +
+			"  " + os.Args[0] + " compile -b arduino:avr:uno --build-property=build.extra_flags=-DPIN=2 --build-property=\"compiler.cpp.extra_flags=\\\"-DSSID=\\\"hello world\\\"\\\"\"-DMY_DEFINE=\"hello world\"' /home/user/Arduino/MySketch\n",
 		Args: cobra.MaximumNArgs(1),
 		Run:  run,
 	}

Diff for: test/test_compile.py

@@ -319,15 +319,15 @@ def test_compile_with_multiple_build_property_flags(run_command, data_dir, copy_
     # Compile using multiple build properties separated by a space
     res = run_command(
         f"compile -b {fqbn} "
-        + '--build-property=\'compiler.cpp.extra_flags=\\"-DPIN=2 -DSSID=\\"This is a String\\"\\"\' '
+        + '--build-property="compiler.cpp.extra_flags=\\"-DPIN=2 -DSSID=\\"This is a String\\"\\"" '
         + f"{sketch_path} --verbose --clean"
     )
     assert res.failed
 
     # Compile using multiple build properties separated by a space and properly quoted
     res = run_command(
         f"compile -b {fqbn} "
-        + '--build-property=\'compiler.cpp.extra_flags=-DPIN=2 "-DSSID="This is a String""\' '
+        + '--build-property="compiler.cpp.extra_flags=-DPIN=2 \\"-DSSID=\\"This is a String\\"\\"" '
         + f"{sketch_path} --verbose --clean"
     )
     assert res.ok