sys/log: Improve the console log level indication

[apc067]

Added the option to configure the string & color of MODLOG levels in the console printout from sysconfig; also made text highlighting attribute (for system log modules & highlighted log levels) configurable.

Since the maximum MODLOG level is often being used to ensure unconditional logging, it too received its own configuration support.

[kasjer]

datarec is not a concept known to mynewt-core

[apc067]

datarec is not a concept known to mynewt-core

Yes, good point - commit message corrected.

[kasjer]

If you have time, you could consider adding colors to syscfg for people with different test.
Name 'MAX' could also be configurable as I assume that in your case it mean something specific and it just happen that LOG_LEVEL_MAX was chosen.

[sjanc]

While clang format is not perfect and gives sometime strange output, overall it should be taken into account for obvious fixes

here eg. LOG_LEVEL_STR() abomination can be ignored but others (eg comments indent) should be taken into account.

We need to move slowly towards coherent style enforced by clangd format..

[sjanc]

lets make this const (it is compile-time const anyway)

[apc067]

If you have time, you could consider adding colors to syscfg for people with different test. Name 'MAX' could also be configurable as I assume that in your case it mean something specific and it just happen that LOG_LEVEL_MAX was chosen.

That's a good idea; will implement it under this PR.

[apc067]

While clang format is not perfect and gives sometime strange output, overall it should be taken into account for obvious fixes

here eg. LOG_LEVEL_STR() abomination can be ignored but others (eg comments indent) should be taken into account.

We need to move slowly towards coherent style enforced by clangd format..

Will fix the comment indent. As for the LOG_LEVEL_STR() butchery, it looks visually amazing - could be sold as a post-modernist poem. :-)