Treat "generic config file" as its own language.

This captures the '*.conf' extension, using the '#' line comment format
which is extremely common (though not universal).

The test data passes with the new config rule, but fails because the
Bitbake tests also run against the `generic_config.conf` file.

languages.json

@@ -296,6 +296,11 @@
       "multi_line_comments": [["(*", "*)"]],
       "extensions": ["v"]
     },
+    "Config": {
+        "name": "Generic config file",
+        "line_comment": ["#"],
+        "extensions": ["conf"]
+    },
     "Cpp": {
       "name": "C++",
       "line_comment": ["//"],

tests/data/generic_config.conf

@@ -0,0 +1,16 @@
+#! 16 lines 10 code 4 comment 2 blanks
+# This is a comment
+this=not_a_comment
+[this_is_a_section]
+and this is not a comment either
+
+# Why is it so hard to create a random file like this?
+foo=bar
+bar=baz
+
+## Tricksy comments!
+more
+lines
+that
+are
+not comments