Changes main package name and fixes files with weird names throwing errors

Fixes conversion of files with a single quote or square brackets in the filename
Moves all files into the net.knarcraft.ffmpegconverter package

pom.xml

@@ -57,7 +57,7 @@
             <url>https://git.knarcraft.net</url>
             <layout>default</layout>
         </repository>
-        <downloadUrl>https://git.knarcraft.net/KnarCraft/FFmpegConvert</downloadUrl>
+        <downloadUrl>https://jenkins.knarcraft.net/job/KnarCraft/job/FFmpegConvert/job/master/lastSuccessfulBuild/artifact/</downloadUrl>
     </distributionManagement>
     <build>
         <plugins>
@@ -71,7 +71,7 @@
                         <manifest>
                             <addClasspath>true</addClasspath>
                             <classpathPrefix>lib/</classpathPrefix>
-                            <mainClass>ffmpegconverter.Main</mainClass>
+                            <mainClass>net.knarcraft.ffmpegconverter.Main</mainClass>
                         </manifest>
                     </archive>
                 </configuration>