Escape backslashes in `generate_test_runner.rb`

[BrianSipos]

Currently, if a parameterized test case includes a literal backslash that will be passed-through to the test names in unity (when cmdline_args=true option is used) and cause compilation issues. The backslash needs to be C-escaped in the source.

[BrianSipos]

A small patch which seems to fix this is

--- a/auto/generate_test_runner.rb
+++ b/auto/generate_test_runner.rb
@@ -467,7 +467,7 @@ class UnityTestRunnerGenerator
           output.puts('      UNITY_PRINT_EOL();')
         else
           test[:args].each do |args|
-            output.puts("      UnityPrint(\"  #{test[:test]}(#{args.gsub('"', '').gsub("\n", '')})\");")
+            output.puts("      UnityPrint(\"  #{test[:test]}(#{args.gsub('"', '').gsub("\n", '').gsub('\\', '\\\\\\')})\");")
             output.puts('      UNITY_PRINT_EOL();')
           end
         end