Removing a lot of old system variables from BSApp

Removing a lot of old system variables from BSApp

* App.php: Removed BSApp->application, BSApp->appPath, BSApp->appVersion, BSApp->webPath
(BSApp::set_application): Removed
(BSApp::get_application): Removed
(BSApp::set_app_path): Removed
(BSApp::get_app_path): Removed
(BSApp::set_app_version): Removed
(BSApp::get_app_version): Removed
(BSApp::set_web_path): Removed
(BSApp::get_web_path): Removed
* Printer.php: Add BSPrinter->copyright to store copyright information for the footer of pages
(BSPrinter::get_copyright): New method
(BSPrinter::set_copyright): New method
* PrinterNavigation.php: BSPrinter->realm is now the only component used for titles
(BSPrinterNavigation::constructHeaderHtml): Now uses only the realm
* PrinterRootElementPage.php: Again, only use BSPrinter->realm
(BSPrinterRootElementPage::paint): Switch to using only the realm in the title and using BSPrinter->copyright in the footer