New package for future legacy classes
Move jApp as Jelix/Core/App.php
Rename jApp to Jelix\Core\App
Move config classes to Jelix/Core
Rename jConfig* classes to \Jelix\Core\Config\*
Replace jelix_read_ini by new method jIniFile::readAndMergeObject()

Since the extension does not exist anymore, we can remove jelix_read_ini.
Move jAppManager to Jelix/Core/
Rename jAppManager to Jelix\Core\AppManager
Use new class name in jelix-scripts
Move jAutoloader to Jelix/Core/
Rename jAutoloader to \Jelix\Core\Autoloader
Move jClasses, jClassBinding, jIncluder to Jelix/Core
Rename classes jClasses, jClassBinding, jIncluder
Move jProfiles to Jelix/Core
Rename jProfiles to \Jelix\Core\Profiles