RAR files extract corrupted files if the filenames are not encrypted

[DeltaJordan]

When a file from the viewing window of the program is opened or extracted from a password-protected rar file, the resulting file is corrupted. The problem is the library this application uses to open the archive, SharpCompress, does not have a check for passwords for rars and also does not have validation for file data, like CRC. I may have to find a way to validate the file, possibly by the file size because it seems to create an empty file.

Need to keep an eye on CRC Validation support in SharpCompress: adamhathcock/sharpcompress#246

[DeltaJordan]

Added filesize check 51c2130 which fixes the error for the extract button in my tests. Still need to fix it in the the drag-drop handler