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

README.md

@@ -4,14 +4,11 @@ waveshare electronics
 
 ## 中文:  
 Jetson Nano、Raspberry Pi、Arduino、STM32例程
+* Python (Jetson Nano、Raspberry Pi、Python 2/3)
 * Jetson Nano:  
     > C  
-    > Python2  
-    > python3  
 * Raspberry Pi:  
     > C(BCM2835\WiringPi)  
-    > Python2  
-    > python3  
 * Arduino:  
     > Arduino UNO  
 * STM32:  
@@ -23,14 +20,11 @@ http://www.waveshare.net
 
 ## English:  
 Jetson Nano、Raspberry Pi、Arduino、STM32 Demo:  
+* Python (Jetson Nano、Raspberry Pi、Python 2/3)
 * Jetson Nano:  
     > C  
-    > Python2  
-    > python3  
 * Raspberry Pi:  
     > C(BCM2835\WiringPi)  
-    > Python2  
-    > python3  
 * Arduino:  
     > Arduino UNO  
 * STM32: