Maintenance revision 1.1.1.1

In 1.1.1 heaters and temperature management was revised to accomodate to new and upcoming add-ons, and provide more flexibility for customization, but unfortunately that caused occasional anomalies with some of FABtotum's heads. This maintenance revision aims to fix those cases, in particular:

• Fix heaters not working inside PID tuning procedure (M303 command)
• Fix missing bed temperature readings with some toolheads

Moreover, the following enhancements has been added:

• Better stability when reconfiguring tools and installing new heads
• Fix M563 output when the bed's thermistor is active without the bed heater being so