Evolve MySQL caching methods
Woops, fix configs changed by accident
Rename Cache class to CacheObject for clarification
Add language validation method

This is used to normalize a language variable. Sometimes we have to make
sure a variable is a language constant. CSSc\Language::validate() returns
the same variable input or CSSc\Language::UNKNOWN if this variable is not
a language constant.

Example:
    $lang = CSSc\Language::CSS;
    CSSc\Language::validate($lang); // Returns the same value

    $wrongLang = 0xFFA123;
    CSSc\Language::validate($wrongLang) // Returns CSSc\Language::UNKNOWN
Evolve cache system
Add todo: checksum includes
Search for cache only when language is not CSSc\Language::GUESS