GH-140 Bump run server version to 1.21.4 and add old legacy hex color transformers

[CitralFlo]

[coderabbitai]

Walkthrough

The changes update the Minecraft server task configuration in the build file by changing the Minecraft version from "1.20.4" to "1.21.4". Additionally, a new regular expression pattern has been added to the legacy formatting class to match hexadecimal color codes formatted with an "&x" prefix. The processing method in this class now uses the new pattern for converting these color codes into the expected format, while continuing to handle previously supported formats. Furthermore, a new unit test has been introduced to ensure that the conversion from legacy hex formatting to the Adventure format works correctly, enhancing test coverage for this functionality.

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Reviewing files that changed from the base of the PR and between 0ad67f8 and 445c9e2.

📒 Files selected for processing (1)

• chatformatter-core/src/test/java/com/eternalcode/formatter/legacy/LegacyTest.java (1 hunks)

🔇 Additional comments (1)

chatformatter-core/src/test/java/com/eternalcode/formatter/legacy/LegacyTest.java (1)

53-61: Great test addition for hex color support!

This test nicely covers the new feature for legacy hex color formatting. It verifies that the format used by plugins like HexNicks converts correctly to Adventure format. Good job using a clear example that shows both the color conversion and formatting retention.

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[CitralFlo]

Tested with hexNicks (recently user reported issue on discord Support - thankfully hexNicks has placeholder for MiniMessage)
default placeholder should always work

[imDMK]

gj