Add Hotkeys in Macro Mode Similar to Micro Mode

[Zhirnoff]

Description:
Addition of specific hotkeys in Macro Mode that are already present in Micro Mode. This enhancement aims to improve user efficiency and streamline the workflow in Macro Mode.

Requested Hotkeys:

Select Single Bond Tool: 1 key
Erase Operation with Delete key when hovering on monomer
Erase Operation with Backspace key when hovering on monomer

[OlgaTitovaEPAM]

Works as expected:
Open File: Ctrl + O
Save File: Ctrl + S

Requested Hotkeys:
Select Single Bond Tool: 1
Erase Operation with (Del) when hovering on monomer
Erase Operation with (Backspace) when hovering on monomer