Change version from a numeric to a string, in order to
differentiate between versions like "1.1" and "1.10".
Original-commit: ca21048bd2f832b20bb36763f76d46b861b697a5
This renames e31x_rfnoc_image_core.* to e310_rfnoc_image_core.*. This
makes the naming consistent with the rest of the build process (which
uses "e310" for all variants of e31x) and fixes an issue in which the
wrong file name was used by rfnoc_image_builder.
Original-commit: bbd43b16e18ef0a0311ddf4635cbd29c4ac3c367
Wade Fife