initial port to fabric 1.21.5

This port was inspired by the #4198 port for spigot 1.21.5 for the
NBT updates. Like that it also does not implement the new blocks.

Only light testing has been done, but it seems to work just as under
1.21.4 so far.

Note that gradle had to be updated to 8.12.

fabric-1.21.5/build.gradle

@@ -0,0 +1,73 @@
+plugins {
+	id 'fabric-loom' version '1.10-SNAPSHOT'
+}
+
+archivesBaseName = "Dynmap"
+version = parent.version
+group = parent.group
+
+eclipse {
+    project {
+        name = "Dynmap(Fabric-1.21.5)"
+    }
+}
+
+sourceCompatibility = targetCompatibility = compileJava.sourceCompatibility = compileJava.targetCompatibility = JavaLanguageVersion.of(21) // Need this here so eclipse task generates correctly.
+
+configurations {
+    shadow
+    implementation.extendsFrom(shadow)
+}
+
+repositories {
+    mavenCentral()
+    maven { url 'https://oss.sonatype.org/content/repositories/snapshots' }
+}
+
+dependencies {
+    minecraft "com.mojang:minecraft:${project.minecraft_version}"
+    mappings "net.fabricmc:yarn:${project.yarn_mappings}:v2"
+    modImplementation "net.fabricmc:fabric-loader:${project.loader_version}"
+    modImplementation "net.fabricmc.fabric-api:fabric-api:${project.fabric_version}"
+
+    compileOnly group: 'com.google.code.findbugs', name: 'jsr305', version: '3.0.2'
+
+    shadow project(path: ':DynmapCore', configuration: 'shadow')
+
+    modCompileOnly "me.lucko:fabric-permissions-api:0.1-SNAPSHOT"
+    compileOnly 'net.luckperms:api:5.4'
+}
+
+loom {
+    accessWidenerPath = file("src/main/resources/dynmap.accesswidener")
+}
+
+processResources {
+    filesMatching('fabric.mod.json') {
+        expand "version": project.version
+    }
+}
+
+java {
+    // Loom will automatically attach sourcesJar to a RemapSourcesJar task and to the "build" task
+    // if it is present.
+    // If you remove this line, sources will not be generated.
+    withSourcesJar()
+}
+
+jar {
+    from "LICENSE"
+    from {
+        configurations.shadow.collect { it.toString().contains("guava") ? null : it.isDirectory() ? it : zipTree(it) }
+    }
+}
+
+remapJar {
+    archiveFileName = "${archivesBaseName}-${project.version}-fabric-${project.minecraft_version}.jar"
+    destinationDirectory = file '../target'
+}
+
+remapJar.doLast {
+    task ->
+        ant.checksum file: task.archivePath
+}