Fix for the issue https://github.com/riscv-software-src/riscof/issues/62

fixes to be compatible with riscv-config 3.2.0+

This function will now pick the first RVTEST_ISA string that is a proper subset of the dut_isa

Fix riscv config version

Fix riscv_config dependency version to 2.10.1

Fix isa generation logic to account for same test with different XLENs.

Fix to ignore irregularities in prefixes of isa. RV32 and RV64 isa can be applicable for the same test.

rename the "master" branch of riscv-arch-test to "main" 

Doc dependency fix

[skip ci] fix broken links in docs

add isa strings of bitmanip and crypto scalar specs