Initial support of templates and so on (#71)

* Initial syntax is the following:

    * $template{{ some JS code here }} - simple template based on JS
      code inside. It works the same as lambda functions, but calculates
      only once.
    * aw_count(regex) - keys count found for given regex
    * aw_keys(regex, [separator]) - keys found for given regex and
      joined by using given separator
    * aw_names(regex, [separator]) - key names found for given regex and
      joined by using given separator (the same as previous but w\o $)

  The template and function syntax may be changed before release.

* replace `foreach` to `for (auto foo : bar)` and update CONTRIBUTING.md
  accordingly

sources/awdebug.h

@@ -28,12 +28,6 @@
     "category}][%{function}] %{message}"
 #endif /* LOG_FORMAT */
 
-// redefine info because it doesn't log properly
-#ifdef qCInfo
-#undef qCInfo
-#endif /* qCInfo */
-#define qCInfo qCDebug
-
 
 Q_DECLARE_LOGGING_CATEGORY(LOG_AW)
 Q_DECLARE_LOGGING_CATEGORY(LOG_DP)