Individual column filters

[mwouts]

Closes #69

TODO

• [x] Fix the tests
• [x] Allow filters either in the table header or footer
• [x] Write a section on the column filters in the documentation
• [x] Remove "post_dt_code" unless we have a concrete use case
• [x] eval_function should apply to just "initComplete"

[lgtm-com[bot]]

This pull request introduces 2 alerts when merging d833f27d3f2a3fde330b77bdb77b960e1be6d839 into 8f6569385d652bb1ef116d817270b840a74c4873 - view on LGTM.com

new alerts:

• 1 for Syntax error
• 1 for DOM text reinterpreted as HTML

[codecov-commenter]

Codecov Report

Merging #81 (70d9763) into main (8f65693) will decrease coverage by 3.66%. The diff coverage is 59.52%.

:exclamation: Current head 70d9763 differs from pull request most recent head 1cbf467. Consider uploading reports for the commit 1cbf467 to get more accurate results

@@            Coverage Diff             @@
##             main      #81      +/-   ##
==========================================
- Coverage   95.51%   91.84%   -3.67%     
==========================================
  Files          16       16              
  Lines         379      417      +38     
==========================================
+ Hits          362      383      +21     
- Misses         17       34      +17     

Impacted Files	Coverage Δ
itables/javascript.py	84.11% <51.42%> (-8.64%)	:arrow_down:
itables/options.py	100.00% <100.00%> (ø)
itables/version.py	100.00% <100.00%> (ø)

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