Improve update-info-status

[markus2330]

• nodoc: With 40 vs. 41 lines it seems a bit arbitrary. In this case maybe something like <30 add nodoc >80 remove nodoc.
  For example base64 could be considered as documented (34 lines, @petermax2 what do you think?), but desktop is rather poorly documented (48 lines, many of them empty, empty lines might be be useful to consider, too).
  src/plugins/uname/README.md is also a corner case: what it does is trivial (32 lines)
• unittest: should also have some metric, at least the tests as copied from template should not lead to unittest
• plugins doc and template should not be touched
• resolver should have nodep. It has LINK_LIBRARIES, but only of pthreads, which is part of libc.

Issues we can live with:

• configurable: keytometa gets configurable removed wrongly (configuration via. metadata)
• timeofday and tracer get configure added wrongly (they use elektraPluginGetConfig, but only for /module, which is not really configuration).

[petermax2]

Everything base64 does is documented in README.md essentially. I think in-code documentation and comments are important as well.

[petermax2]

desktop's documentation does not really tell me what desktop is supposed to do:

The plugin is informational and mainly be used to provide context for
other configuration. See elektrify-getenv.

[markus2330]

desktop's documentation does not really tell me what desktop is supposed to do

That was my point ;)

[markus2330]

These problems seem to be resolved now. #666 is about adding new infos/status.