dev: Revert back to Maven

I have no idea about how Gradle works, and I also have no idea of the Kotlin language (which I used for configuration). Not a great experience. I only switched for resource filtering, and I now know how to do that with Maven, so it's time to turn back around.

- Restores files from before merging #4 (commit c03212)
- Modifies plugin.yml for resource filtering with Maven
- Modifies pom.xml to filter resource plugin.yml

Author: kiriDevs

.github/workflows/codeql.yml

@@ -22,7 +22,7 @@ jobs:
         java-version: "17"
         java-package: jdk
         architecture: x64
-        cache: gradle
+        cache: maven
 
     - name: Autobuild
       uses: github/codeql-action/autobuild@v2

.github/workflows/gradle_build.yml .github/workflows/maven_build.yml

@@ -1,9 +1,9 @@
-name: Gradle Build
+name: Maven Build
 on: [push, pull_request]
 
 jobs:
   build:
-    name: Gradle Build
+    name: Maven Build
     runs-on: ubuntu-latest
 
     steps:
@@ -17,13 +17,13 @@ jobs:
         java-version: "17"
         java-package: jdk
         architecture: x64
-        cache: gradle
-      
-    - name: Use gradlew to build the project
-      run: ./gradlew build
+        cache: maven
+
+    - name: Build project with Maven
+      run: mvn verify --file pom.xml
 
     - name: Upload build artifacts
       uses: actions/upload-artifact@v3
       with:
         name: kiriSMP_${{ github.sha }}
-        path: build/libs/ksmpplugin-*.jar
+        path: target/ksmpplugin-*.jar

.gitignore

@@ -1,6 +1,5 @@
-# Ignore gradle build output and working files
-/build/
-/.gradle/
+# Ignore maven build output 
+/target/
 
 # Ignore workspace configuration
 /.idea/