v0.26.0

Added

• Add infinite, simulation-only memory axi_sim_mem.
• assign.svh: Add macros for assigning between structs, both inside a process
  (AXI_SET_*_STRUCT) and outside a process (AXI_ASSIGN_*_STRUCT). This is safer than assigning
  structs with a simple =, because the macros assign individual fields. (Fields that mismatch
  between two structs, e.g., due to different user signal widths, should, and in some cases
  must, be still assigned separately.)

Changed

• Rename the following classes in axi_test to follow the convention that all user-facing objects
  in this repository start with axi_:
  • rand_axi_lite_master to axi_lite_rand_master,
  • rand_axi_lite_slave to axi_lite_rand_slave,
  • rand_axi_master to axi_rand_master, and
  • rand_axi_slave to axi_rand_slave.