Replaced loading of ot_commands.ot with adding references to ot_commands_ot.cpp C++ functions
Had to remove all overloaded functions from ot_commands.ot, but most were not used anyway.
Replaced loading of ot_made_easy.ot with adding references to ot_made_easy_ot.cpp C++ functions
Had to rename the Chai functions with an OT+ME_ prefix so they became static.
Removed the old Chai OT_ME() object that is no longer valid.