Add support for pipeline root.when conditions

[LamaAni]

close #283
close #688

As a ci user I would like to set a file/yaml global when condition, to disable pipeline runs. This allows easier to write control for the pipeline events, branches and metadata.

Changes

• add root when conditions:
  • branch
  • repo
  • event
  • tag
  • platform
  • instance
  • path
• add docs
• update yaml schema
• wait for Allow multiple when filters #686

Fixes

1. In hook.go, when one of the yaml(s) was filtered by branch the hook would not fire. Changed to if all are filtered hook is not fired.
2. changed function name 'branchFiltered' -> 'checkIfFiltered'

[codecov-commenter]

Codecov Report

Merging #770 (2695014) into master (7db7e97) will increase coverage by 0.14%.
The diff coverage is 100.00%.

❗ Current head 2695014 differs from pull request most recent head d6d0f9e. Consider uploading reports for the commit d6d0f9e to get more accurate results

@@            Coverage Diff             @@
##           master     #770      +/-   ##
==========================================
+ Coverage   49.57%   49.71%   +0.14%     
==========================================
  Files          86       86              
  Lines        6548     6557       +9     
==========================================
+ Hits         3246     3260      +14     
+ Misses       3111     3106       -5     
  Partials      191      191              

Impacted Files	Coverage Δ
server/shared/procBuilder.go	85.13% <100.00%> (+0.51%)	⬆️
server/logging/log.go	54.65% <0.00%> (+5.81%)	⬆️

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[6543]

I think this should do it, but I like to have some more unit tests for pipeline.when filters ...
... so when I do refactor It wont break

[6543]

conflicts ...