* refactor all code that builds csources
* fixup
* nim_csourcesDir_v0 + nim_csourcesDir
* remove deprecated, unused scripts from ci/
* reuse nimCsourcesHash in ci
* simplify CI pipelines by reusing nimBuildCsourcesIfNeeded
* simplify ci_docs.yml by reusing nimBuildCsourcesIfNeeded
* cleanup
* use csources_v1 as destination dir
* fixup
* remove pushCsources
* address comment: remove build.sh support for now
* fixup
* 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 skip ci in azure pipelines
* [skip ci] example of a commit that skips CI
* example of a commit that does not skip CI
* fix github actions logic for ci skip handling
* [skip ci] example of a commit that skips CI for all pipelines
* example of a commit that does not skip CI for any pipeline
* azure-pipelines: cache csources to speed up build
Building csources takes about 2-4 mins, and since it hasn't changed for
a long time, employ some caching to cut the time spent.
* azure-pipelines: remove ppa avoidance configs
Testing shows that there aren't any difference between having this and
not having it, so removing this to simplify the code.
