Fix name of the \Mibew\RequestProcessor\ProcessorException class
Use MIBEW_WEB_ROOT constant

Replace $mibewroot global variable with MIBEW_WEB_ROOT constant
Remove $knownAgents global variable
Remove $default_locale and $home_locale globals
Use MIBEW_ENCODING constant

Replace $mibew_encoding global variable with MIBEW_ENCODING constant