Basic ogc wkt parsing into crsobj works.

Next:
- Comb through to smooth out kinks, like how to handle default values
such as datum (not always needed) or unit when not specified (on parsing
or on outputting). Or handling basic lat long crs without proj. Adding
wkt axis parsing. Cleaning messy wkt parsing maybe.
- And finally add esri wkt, copy paste mostly, but some small
differences.

testfiles/natearth.prj

@@ -0,0 +1 @@
+GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]