Cdata sections

[NelsonVides]

It can happen that some subelement can contain a payload with for example, a big json object. The xml element could be use as an envelope for routing other abstract payloads, and so escaping them could make the blob much bigger for the network transfer, and very unreadable for the debugging eye. So at least make it optional that you want to use cdata escaping when needed.

There's also a couple of "breaking" changes, current code was doing iolist_to_binary for the function called to_iolist, which seems dummy, you might as well call to_binary if you want a binary. iodata usually has a performance advantage improvement for network transmission, so keep iodata as iodata when you want it.

[codecov-commenter]

Codecov Report

Merging #59 (62ccc33) into master (3299e97) will increase coverage by 1.83%. The diff coverage is 92.30%.

@@            Coverage Diff             @@
##           master      #59      +/-   ##
==========================================
+ Coverage   71.49%   73.32%   +1.83%     
==========================================
  Files           7        7              
  Lines        1098     1106       +8     
  Branches      158      160       +2     
==========================================
+ Hits          785      811      +26     
+ Misses        313      295      -18     

Impacted Files	Coverage Δ
src/exml_nif.erl	41.66% <ø> (ø)
src/exml.erl	91.42% <90.90%> (ø)
c_src/exml.cpp	94.49% <93.33%> (-0.19%)	:arrow_down:
c_src/rapidxml_print.hpp	59.56% <0.00%> (+10.38%)	:arrow_up:

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