Unify all Python trees for both RPi and Jetson Nano, Py2 and Py3

* Move lib files into waveshare_epd package
  * Use int() where integer division is needed
  * Use logging (debug level) in library files, so they can be used by a
    user script without print()s being output
  * Use logging (info level) in example files
  * Move Font.ttc file into pic directory
  * epdconfig.py: Detect RPi or Jetson Nano
  * Search for sysfs_software_spi.so in several places
  * Include both Jetson and RPi readme files
  * Include setup.py for package installation
  * Fix few small syntax errors preventing setuptools byte-compiling

Python/setup.py

@@ -0,0 +1,12 @@
+import sys
+from setuptools import setup
+
+
+setup(
+    name='waveshare-epd',
+    description='Waveshare e-Paper Display',
+    author='Waveshare',
+    package_dir={'': 'lib'},
+    packages=['waveshare_epd'],
+)
+