unify gitignores

the one in templateplugin needs to remain where it is, as it is part of
the template

Author: abextm

.gitignore

@@ -1 +1,9 @@
-.idea
+.gradle/
+.idea/
+build
+.project
+.settings/
+.classpath
+nbactions.xml
+nb-configuration.xml
+nbproject/