Don't rely on file endings to deduce file content types #12
Description
Currently, when deducing file types, the following is used:
FileTypes.probeContentType
This in turn delegates to standard JDK Files content type probing, which is a bit primitive. It e.g. relies on files having a suffix.
Instead, we should use TikaLiteFileTypeDetector util to determine file content type, which should be a bit more capable.
And while we're at it: We should upgrade Tika to use the latest major version. We're on 1.x, and the latest is 2.x (which has some breaking changes).