Revise IDE configurations (KDEV4)

.gitignore

@@ -0,0 +1,25 @@
+target/
+lib/
+builds/
+shade/
+test-files/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+# https://github.com/takari/maven-wrapper#usage-without-binary-jar
+.mvn/wrapper/maven-wrapper.jar
+.idea/
+packr-conf/
+packr*.jar
+
+# Don't judge, these are my test files
+*.avatars
+*.worldsmarks
+
+# Kate Project
+.kateproject