Replace GlobalContext by HeaderContext

[vjik]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	✔️

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 10 lines in your changes missing coverage. Please review.

Project coverage is 83.66%. Comparing base (ddcf11f) to head (a29d9ac).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Column/Base/GlobalContext.php	85.71%	10 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #269      +/-   ##
============================================
- Coverage     83.74%   83.66%   -0.09%     
+ Complexity      631      629       -2     
============================================
  Files            51       50       -1     
  Lines          2147     2136      -11     
============================================
- Hits           1798     1787      -11     
  Misses          349      349              

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[samdark]

The overall idea is that a common context for the whole widget makes sense in any place, be it footer, header or data cell.

[samdark]

👍