Add support for Application Reboot

[mablem8]

• Add a description of Application Reboot to DOCUMENTATION.md
• Add Application Reboot to c-implementation/tab.c with an external handler
• Add a handler implementation of Application Reboot to cdh.c
• Add a handler implementation of Application Reboot to com.c
• Add an implementation of Application Reboot to python-implementation/tab.py
• Add testing of Application Reboot in python-examples/tx/tx_example.py
• Test support for Application Reboot with c-examples/cdh-monolithic and python-examples/tx