Riscv-ctg

- Fixed canary definition

- Fixed use of lowercase LI.
- Fixed correctval to ?? in comments.
- Fixed sw to SREG for K tests.
- Added canaries and signature boundary labels.

- Added support for evaluating derived fields for evaluating coverpoints using the instruction object class

- Added support for bitmanip and crypto scalar coverpoint test generation

- Added support for cross_comb coverpoint test generation

- Added support for a distributed template database.
- Added generic mechanisms to generate data sections based on test instances.
- Update templates for floating point tests.
- Fix test generation and macros for floating point tests.