Update project configuration and refactor codebase

- Migrated Minestom dependency to new groupId.
- Added Maven Shade plugin for packaging.
- Switched Java version to 21 and corrected JDK settings.
- Refactored terrain generation logic to use the updated Minestom API.
- Replaced deprecated particle creation methods.
- Enabled Velocity proxy support.
- Updated various configuration files to align with the new build setup.

target/maven-archiver/pom.properties

@@ -0,0 +1,5 @@
+#Generated by Maven
+#Fri Dec 19 20:45:21 CET 2025
+artifactId=EndlessJumper
+groupId=org.example
+version=1.0-SNAPSHOT

target/maven-status/maven-compiler-plugin/compile/default-compile/createdFiles.lst

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+eu/mhsl/minecraft/endlessjumper/generator/BlockPalette.class
+eu/mhsl/minecraft/endlessjumper/TerrainGenerator.class
+eu/mhsl/minecraft/endlessjumper/generator/JumpGenerator.class
+eu/mhsl/minecraft/endlessjumper/BlockMath.class
+eu/mhsl/minecraft/endlessjumper/EndlessJumper.class

target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst

@@ -0,0 +1,5 @@
+/home/elias/projects/Minecraft/EndlessJumper/src/main/java/eu/mhsl/minecraft/endlessjumper/EndlessJumper.java
+/home/elias/projects/Minecraft/EndlessJumper/src/main/java/eu/mhsl/minecraft/endlessjumper/BlockMath.java
+/home/elias/projects/Minecraft/EndlessJumper/src/main/java/eu/mhsl/minecraft/endlessjumper/TerrainGenerator.java
+/home/elias/projects/Minecraft/EndlessJumper/src/main/java/eu/mhsl/minecraft/endlessjumper/generator/JumpGenerator.java
+/home/elias/projects/Minecraft/EndlessJumper/src/main/java/eu/mhsl/minecraft/endlessjumper/generator/BlockPalette.java