Add cg.py for Nim refugees in PythonLand; Add `writeContAddrTempFile`

See python/cg.md for some preliminary documentation.

python/cg.py is quite incomplete relative to cligen.nim, but it does the basics of what I need right now to not feel CLI framework-impaired when there is some Py lib/ecosystem I want to write a quick script around.. python/pq.py is a full usage example in the rp / crp family of awk imitations.

Also add the almost never supported SGR attribute conceal & its negation -conceal and a little utility function cligen/osUt.writeContAddrTempFile

Just to make the VC tip a clean release after init syntax thrash

That's it.

Default-default-value controls, $usehdr & ClCfg.(wrap(Doc|Table)|subRowSep)

RELEASE_NOTES.md has details as usual, but controls for how string & bool default values are rendered in help messages have been added to ClCfg for CLauthor default-setting with CLuser override in config files.. basically minStrQuoting, trueDefaultStr, & falseDefaultStr. These were, of course, always alterable via defining custom argHelp, but this tunability shouldn't impact non-users-of it. Also added $usehdr for the main usage template, ClCfg.wrap(Doc|Table) and abstract the old newline-only separator into ClCfg.subRowSep and fix an old bug related to ignoring the CLuser use|usage template.

In short, basically several new fine-grained format controls.

Very minimal change to config file finding

See RELEASE_NOTES.md and git log -p. Really should be just an internal simplification, but I wanted to make this its own release just in case.

Very minor new feature for dispatchMulti

Add ability for both multi-cmd -h & multi-cmd h to interpolate in doc from the X in ["multi", doc=X] fragment. This helps to explain global options, available from the recent Vars feature (and also to describe the overall program).

Also make test.sh/GNUmakefile more environment-portable by turning off --styleCheck

Better fix for `cligen/statx` & style fix

Those two things are about it.

Fix a few bugs/compatibility issues

• Fix generic instantiations of doArgParse (#233) on newer Nim compilers courtesy of @metagn

• Make misc lib code compile under --hint[Name]=on --styleCheck=usages --styleCheck=error

• Vaguely robust (if information dropping) solution to Alhadis/OSC8-Adoption#13 (comment)

Make things easier for system package managers

By including a very simple make/gmake install with a re-targetable destdir.

Nim-devel is moving to better `hash(openArray[byte])` ..

.. and a very slow (several to order of magnitude slower even on short strings) hashData (OG string hasher, actually).

So, it seems important enough to warrant punching a release changing that default in cligen/mslice.hash(MSlice) which is the only change of this release.

Very minor bugfix release

To fix two undesired output format cligen/strUt.ecvt bugs (and make that test suite not super slow by default).