Year start 2025 and minor improvements and fixes

[tonhuisman]

Features and fixes:

• Update copyright year to 2025
• [Readme.md] Updates and fixes
• [P144] Update docs to show it's available in the Climate build
• [Build] Add plugins using Serial to check for enabling ESPEasySerial lib
• [Build] Add some missing plugins to Custom-sample.h
• [Docs] Updates for the Tools page documentation
• [ColorCode] Reverted and changes moved to [ColorCode] Combined updates for 2025-01 #5196
• [P076] Add preset for Shelly Plus PLUG-S (ESP32 only)
• [CustomDashboard] Serve .esp pages streaming to avoid HTTP/0.9 response (forum issue) (confirmed)
• [Custom-sample] Use default nr of samples for stats, unless manually overridden
• [Custom] Fix outdated comments related to PlatformIO Custom builds