GEOMESA-508 Factoring Out Common Code from STIdxStrategy and QueryPlanner

* Factored out four duplicated functions from STIdxStrategy and QueryPlanner into a trait.
GEOMESA-493 geomesa-raster module

added geomesa-raster module to project
GEOMESA-433,GEOMESA-434,GEOMESA-484 Develop raster and ingest handling code for integration with GeoMesa. Implement raster ingest as a new maven submodule. Create a new Store for raster data.
GEOMESA-478 Create a Raster Filtering Iterator

First pass RFI modeled after AIFI and moved into geomesa-raster module.
still a work in progress for GM-489, 473, 471
renamed to Geomesa Coverage Format, added @wjp22903's work for image serialization, small UI changes
minor cleaning up of code