updating http reference for condstr

Cleaning fflags csr after each test

fix for LLVM compiler support

Fix changelog and add github action to check for changelog update on merge.

Added helper macro based sig offset update.

Patch for issue 240. Fixes #240

K ext: up-to-date the K extension for the V.1.0.0 ratified spec

Include files sync up from RISCV-CTG

Remove `misalign1` test from the list of failed tests in disclaimer.

Expand SREG/REGWIDTH macros for RVTEST_SIGUPD_P64 and RVTEST_SIGUPD_PK64: they are valid in RV32 only

Remove SREG/LREG/REGWIDTH/MASK definition for XLEN==64 && FLEN==32: FLEN value should not affect their value