[WIP] Add signalBitMask to MemoryDescription and MemoryGenomeDescription

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

Add a new member signalBitMask to MemoryDescription (uint8_t, default 0b11111111) and MemoryGenomeDescription. Adapt TO.cuh, Object.cuh, DescriptionConverterService, ObjectFactory, DataAccessKernel, SerializerService, GenomeDescriptionHash, DescriptionTestDataFactory, GenomeDescriptionValidationService, etc.
The following logic should be implemented:

• The lowest bit (i.e. bit pos 0) should correspond to channel[0], the highest bit to channel[MAX_CHANNELS - 1] (MAX_CHANNELS is currenlty 8).
• In MemoryProcessor: in all modes only the channels of the cell's signal can be modified if the corresponding bit in the bit mask is 1. otherwise the corresponding channel should be left unchanged
  In NodeEditorWidget: For each bit in the mask there should be a AlienGui::Checkbox to edit it.

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