adds bugfixes and pom version bump

We were contacted by Dr. Alex Herbert on account of there being a bug with the calculation of the FIRE number on images that are not a power of 2 and a bug regarding angle values in degrees instead of radians

This has led to the following changes:

1. FRC_ Plugin was added to package ch.epfl.biop.frc (instead of no package)
2. POM was updated to use latest pom-scijava version
3. Fire number is now computed correctly by checking image size
4. Images are ensured to be a multiple of two by adding one pixel of padding as needed
5. Angles are converted to radians, ensuring a better radial sampling