Notepad++ 5.8.4

- Fix memory leak problem while switching tab.
- Fix User Defined Language dialog docking problem under Windows 7.
- Fix backwards search with Asian codepage problem.
- Add a new capacity in context menu: the menu item and folder item can be renamed (and in whichever language).
- All the supported encoding charsets can be set as default in "New Document Settings".
- Remove Calltip restriction from plugins side.
- Add "-alwaysOnTop" command line argument.
- Fix icon display glitch in shell extension context menu.