HASPmota p<x>b<y>.delete to delete an object

[s-hadinger]

Description:

HASPmota now supports p1b2.delete to delete a widget.

Note: to be consistent with OpenHASP, the syntax is p1b2.delete and not p1b2.delete(). I.e. you just need to read the attribute delete and not to call a function

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works with Tasmota core ESP8266 V.2.7.6
• The code change is tested and works with Tasmota core ESP32 V.2.0.14
• I accept the CLA.

NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass