Allow to set a Tika config file

[gggeek]

Provide a default config file, or at least document how to use one.

Recent Tika versions do spit out 2 harmless but annoying warnings on each invocation:

Sep 25, 2019 10:40:14 AM org.apache.tika.config.InitializableProblemHandler$3 handleInitializableProblem
WARNING: J2KImageReader not loaded. JPEG2000 files will not be processed.
See https://pdfbox.apache.org/2.0/dependencies.html#jai-image-io
for optional dependencies.

Sep 25, 2019 10:40:14 AM org.apache.tika.config.InitializableProblemHandler$3 handleInitializableProblem
WARNING: org.xerial's sqlite-jdbc is not loaded.
Please provide the jar on your classpath to parse sqlite files.
See tika-parsers/pom.xml for the correct version.

Those can be removed via usage of a config file