* Implement Markdown indented code blocks
Additional indentation of 4 spaces makes a block an "indented code block"
(monospaced text without syntax highlighting).
Also `::` RST syntax for code blocks is disabled.
So instead of
```rst
see::
Some code
```
the code block should be written as
```markdown
see:
Some code
```
* Migrate RST literal blocks :: to Markdown's ones
* CIs: attempt to use csources_v1
* also updated the BSDs
* also updated azure pipelines
* std modules should not itself use the 'std/' import dir...
* compiler has to be careful with std/ for v1 booting
* Support detection in docker container.
* Get only ID information in os-release.
* Add test to distros module.
* Fix Linux OS detection in Windows.
* Fix OS detection for FreeBSD and OpenBSD.
* posix_other: Haiku now has spawn.h
This is added per https://dev.haiku-os.org/ticket/13446
* posix_other: Add Haiku specific Dirent members
* cpuinfo: Add an implementation for Haiku
* distros: Add basic Haiku support
* encodings: update Haiku support
* fenv, math: Haiku now provides libm
* times: Add Haiku struct members
* ansi_c, osalloc: Add Haiku constants
* threads: Add Haiku support
* testament: Haiku uses LIBRARY_PATH
* nim.cfg: Update Haiku support
libnetwork should only be linked if network functions are used
* threads: Haiku does not support -pthread switch
* tworkingdir: Haiku's env is in /bin
* posix_other: add SIGKILLTHR for Haiku
* sockets: link with libnetwork on Haiku
* coro: correct ucontext.h location
http://pubs.opengroup.org/onlinepubs/009696699/basedefs/ucontext.h.html
* coro: ucontext backend is not available on Haiku
Haiku doesn't provide the <ucontext.h> header, as it was removed from POSIX
* coro: fix setjmp backend
The compiler does not allow statements after a noreturn function
* nativesockets: Haiku doesn't support AI_V4MAPPED
* system: hostOS can contains "haiku"
* os: add support for Haiku's packagefs
packagefs is read-only, but there are writable holes to the underlying
file system as well
* os: update constant for Haiku
