PeaZip 5.8.1

# BACKEND
-(Windows) Updated to 7z 15.09
# FILE MANAGER
> Improved file rename
- added option to mass-rename adding timestamp
- easy rename clicking already selected item
- rename dialog shows quick editing options: lowercase, uppercase, add timestamp
> Various aspect improvements
- more elements follows the system color scheme
- improved aspect of Address and Search bar
- added reset search button in Search Bar
# EXTRACTION and ARCHIVING
> Improved UTF-8 support in Windows
- can now correctly browse 7z-backend supported archives with UTF-8 characters in path/file name
- can now drag and drop (from filesystem and from archives) to target with UTF-8 characters in path name
- can now perform all delete operations (send to recycle bin, fast delete, zeroing, secure delete) on files/folders with UTF-8 characters in path/file name
- can now copy and move files with UTF-8 characters in path/file name
- cannot yet copy directories, or copy file over itself if UTF-8 characters are involved in the command
# 188 file extensions supported
- Added support for EXT2, EXT3 and EXT4 filesystem image files (usually IMG extension), and multi-volume VMDK disk images