First developpements for version 0.4.0

[mwouts]

A few technical improvements in preparation for the next release:

• The Javascript eval_functions function is applied only when requested by the user
• The datatables.net representation is generated with an HTML template that is also a valid HTML file
• We don't do $('head').append any more

[codecov-commenter]

Codecov Report

Merging #42 (3943a08) into main (439fac5) will increase coverage by 1.47%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
+ Coverage   97.79%   99.27%   +1.47%     
==========================================
  Files          10       11       +1     
  Lines         227      275      +48     
==========================================
+ Hits          222      273      +51     
+ Misses          5        2       -3     

Impacted Files	Coverage Δ
itables/javascript.py	99.13% <100.00%> (+3.48%)	:arrow_up:
itables/version.py	100.00% <100.00%> (ø)
tests/test_eval_functions.py	100.00% <100.00%> (ø)
itables/options.py	100.00% <0.00%> (ø)

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