Implement variable speed encoder control with logarithmic speed multiplier

[Copilot]

• Analyze current encoder handling in main.cpp
• Add tracking of last encoder position and timestamp for speed calculation
• Implement logarithmic speed multiplier based on Superfok's approach
• Integrate variable speed into HandleHandController() function
• Test the implementation (logic verified with test program)
• Document the changes in README
• Merge latest dev branch with ESP32Encoder library updates and API fixes

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Variable speed</issue_title>
<issue_description>Migrate functionality from https://github.com/semenmiroshnichenko/Superfok in order to have a encoder:motor relation related on the speed of the encoder rotation (fast rotations->more steps per encoder step)</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #5

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[simonachmueller]

@copilot merge latest dev and try again

[Copilot]

@copilot merge latest dev and try again

Merged latest dev branch successfully. The merge includes ESP32Encoder library update to v0.11.7 and API fix (puType::up). Commit: a9b2705

[simonachmueller]

Needs testing in hardware