POM: bump to latest component versions

The following components were updated:
* ij1-patcher   -> 0.11.1
* imagej        -> 2.0.0-rc-18 (preemptive)
* imagej-legacy -> 0.9.2 (preemptive)
* imagej-ops    -> 0.6.2 (preemptive)
* imagej1       -> 1.49m