The main changes implemented by this PR are:
1. Support for bitmanip draft v.0.92 is dropped.
2. Remaining bitmanip instructions not ratified as part of v.1.00 of
   the bitmanip spec are upgraded to the latest draft (v.0.93).
3. Simultaneous use of the v.1.00 bitmanip instructions and those
   instructions only part of draft v.0.93 is enabled.
4. Rename bext/bdep to bcompress/bdecompress. This is part of v.0.94.
   But it's needed as in v.0.93 as well as in v.1.00 sbext from Zbs
   is renamed to bext, leading to two completely different instructions
   having the same name.
5. Increase the MAX_INSTR_STR_LEN parameter to accomodate longer
   instruction names (bdecompressw has 12 characters).

Signed-off-by: Pirmin Vogel <vogelpi@lowrisc.org>