VelocityFactory sets invalid properties

[OrangeDog]

This may be (the deprecations certainly are) because I upgraded Velocity to 2.3 for a CVE (#511). I haven't checked the old version.

VelocityFactory has some issues:

• RuntimeConstants.ENCODING_DEFAULT is "UTF-8". The property name is actually in RuntimeContants.INPUT_ENCODING. As the default is already UTF-8, this fortunately has no effect.
• RuntimeConstants.RESOURCE_LOADER is deprecated. Replacement is RuntimeConstants.RESOURCE_LOADERS.
• classpath.resource.loader.class is deprecated. Replacement is resource.loader.classpath.class.

Workaround is to ignore VelocityFactory and just make the bean yourself. See also #152.