Fix rename feature in UI

Fixed UI issue - renaming book with name containing path separators and symbols unsupported by host file system.
Linux and Windows builds moved to docker containers.

GUI enhancements

Meta-info, file renaming.
Note, GUI file renaming is using it's own algo - different form CLI version.

Add files from Google Drive for GUI

Merge pull request #38 from rupor-github/gdrive

Add files form Google Drive for GUI

UI fix

Make sure that conversion results are properly detected by UI for all output formats.

More outputPattern formatting

Support short authors list.

Authors

Added support for multiple authors in FB2

Fixing distribution

Correcting cx_Freeze information - yet again.
Removing check for os.path.supports_unicode_filenames - apparently it is "True" for MAC and Win32 but always "False" on Linux.

Binary tag processing

Use detected image type when content-type is empty

UI fixes

Making sure that UI knows file name after conversion with <outputPattern"

Formatting output file name

Move to Python 3.6.5 and up to date modules.

Restructuring of the output file name handling - it is now possible to "derive" output file name(s) from FB2 metadata.

Russian specific transliteration of file names and book metadata replaced with slugify, so full Unicode is now supported.