- Also fix "unterminated listing block" error
- Also pre-process documentation text to escape asciidoc special characters (fixes __v references interpreted as italics)

"&> /dev/null" works as a redirection from stdout/stderr to /dev/null
in Bash but not in POSIX shell (considered as an asynchronous execution
and the result of the "command" command cannot be retrieved).

As a result, it always assumes that Docker always exists.

This commit makes the redirection robust and portable (makes it possible
to detect "no Docker" condition correctly).

Signed-off-by: Tsukasa OI <research_trasio@irq.a4lg.com>

* Add proposal for high-level console API
- Also extend schema and parsers to add new features
(code fragments, definitions, attributes, var-args)

* Change date on copyright notice

* Change further references to 2022

- also modified Makefile to fix building without docker
- also moved a couple of functions out of high-level interrupts API into low-level API,
and moved a couple of types into csi_types.h

* First draft support for high-level interrupt and timer support
- this also required some enhancements to schema and parser, to support
function type declarations and to ensure correct content in docs and headers.
 - Also split each module into a separate yaml
(a single enormous yaml for the spec was too unwieldy).
- Also rename parser to csi_parser as name clashes with another python module.

Signed-off-by: Rafael Sene <rafael@riscv.org>

- Replace placeholders with some initial content
- Add spec-schema and parser (copied from initial home in riscv-admin/rvm-csi
at commit ID 1397673)
- Makefile now auto-generates content
- added minimal initial YAML spec file
- parser needed some tweaks to get what we need