Fetch plugin.yml values from pom.xml where possible

pom.xml

@@ -2,7 +2,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>de.erethon</groupId>
     <artifactId>dungeonsxl</artifactId>
-    <version>0.16.1</version>
+    <version>0.16.2-SNAPSHOT</version>
     <packaging>jar</packaging>
     <name>DungeonsXL</name>
     <url>https://dre2n.github.io</url>

src/main/resources/plugin.yml

@@ -1,5 +1,5 @@
-name: DungeonsXL
-main: de.erethon.dungeonsxl.DungeonsXL
+name: ${project.name}
+main: ${project.groupId}.${project.artifactId}.${project.name}
 version: ${project.version}${buildNo}
 authors: [Frank Baumann, Milan Albrecht, Tobias Schmitz, Daniel Saukel]
 description: ${project.description}