Change the library to more stable version

- Rename libjpconj to jpconj to use it as JpConj, and modify the library resulted to be identical in linux and windows (same name: libjpconj. (so, dll)

- Delete "extern" from the library since it will be called using the header not QLibrary

- Modify the code to call the library and delete linking class (that use QLibrary)

- Add icon for Windows executable