Notepad++ 5.8.6

- Fix langs.xml 0 length problem while user ends session without closing Notepad++.
- Fix empty line count failure (RegExpr).
- Fix task list display glitch under Windows 7.
- Add trim functions (header/trailing/compact feature).
- Add white space and TAB conversion features.
- Fix folding margin to be displayed when opening Notepad++ with a new/empty file (Normal text).
- Fix auto-completion detection language bug.
- Fix the changing theme settings makes switch back to the default theme bug.
- Make english.xml customizable.