Update Code_Overview.md to note that the config object should not be
stored after the "config loading phase".
Remove a few inadvertent cases where a 'config' object was stored
in module member variables.
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
M105 expects get_temp method. Module crashes when gcode_id parameter
is set and M105 called. Add methods as hotfix.
Signed-off-by: Robert Pazdzior <robertp@norbital.com>