Convert calibre modules to ebook_converter.

Here is the first batch of modules, which are needed for converting
several formats to LRF. Some of the logic has been change, more cleanups
will follow.

setup.cfg

@@ -0,0 +1,39 @@
+[metadata]
+name = ebook-converter
+version = 4.9.1
+summary = Convert ebook between different formats
+description-file =
+    README.rst
+author = gryf
+author-email = gryf73@gmail.com
+license = GPL3
+license_file = LICENSE
+url = https://github.com/gryf/ebook-converter
+classifier =
+    Environment :: Console
+    Intended Audience :: Other Audience
+    License :: OSI Approved :: GNU General Public License v3 (GPLv3)
+    Operating System :: POSIX :: Linux
+    Programming Language :: Python
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3 :: Only
+    Programming Language :: Python :: 3.6
+    Programming Language :: Python :: 3.7
+
+[options]
+packages = find:
+install_requires = 
+    filelock
+    python-dateutil
+    lxml
+    css-parser
+    beautifulsoup4
+    tinycss
+    pillow
+    msgpack
+    html5-parser
+    odfpy
+
+[options.entry_points]
+console_scripts =
+    ebook-converter=ebook_converter.main:run