Default registry settings

- core.RegistryValuesFile class added for simplified registry options syntax processing
- Luwrain now understands --add-reg command line option to read registry settings
- registry/common.reg and registry/ru.reg added with initial registry data
- luwrain.sql no longer contains most of previously  stored registry data
VoiceMan support removed (goes to OS-specific jar)

- Speech back-end code removed and saved in OS-specific jar
- Init class tries to load speech back-end from the external jar
- build.xml: Os-specific jar is expected to be in os/ directory
Work on text editing

- core.SystemDirs class is added to simplify getting system pathes
- EmbeddedMultilinedEdit class added
- Content-related methods of MultilinedEditModel go to separate  basic interface MultilinedEditContent
- SimpleArea class now utilizes MultilinedEditContent
- NotepadApp gets new structure with separate Base class
- MultilinedEdit class improvements
- MessageArea class improvements