Adds new integration [Schrolli91/heidelberg_energy_control]

[Schrolli91]

• add new integration for Heidelberg energy control
• fix trailing whitespace in systemair-modbus entry

Checklist

• I've read the publishing documentation.
• I've added the HACS action to my repository.
• (For integrations only) I've added the hassfest action to my repository.
• The actions are passing without any disabled checks in my repository.
• I've added a link to the action run on my repository below in the links section.
• I've created a new release of the repository after the validation actions were run successfully.

Links

Link to current release: https://github.com/Schrolli91/heidelberg_energy_control/releases/tag/v0.9.4
Link to successful HACS action (without the ignore key): https://github.com/Schrolli91/heidelberg_energy_control/actions/runs/22320015501/job/64575459595
Link to successful hassfest action (if integration): https://github.com/Schrolli91/heidelberg_energy_control/actions/runs/22320015501/job/64575459616

[hacs-bot]

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[hacs-bot]

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