Use raw pointers instead of shared pointers for rule targets

[Anilm3]

No description provided.

[codecov-commenter]

Codecov Report

Merging #141 (1e53fac) into master (15b2282) will not change coverage.
The diff coverage is 61.53%.

@@           Coverage Diff           @@
##           master     #141   +/-   ##
=======================================
  Coverage   64.71%   64.71%           
=======================================
  Files          63       63           
  Lines        3143     3143           
  Branches     1447     1447           
=======================================
  Hits         2034     2034           
  Misses        309      309           
  Partials      800      800           

Flag	Coverage Δ
waf_test	64.71% <61.53%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/collection.cpp	62.71% <0.00%> (ø)
src/collection.hpp	100.00% <ø> (ø)
src/context.hpp	50.00% <ø> (ø)
src/exclusion/input_filter.hpp	100.00% <ø> (ø)
src/exclusion/rule_filter.hpp	100.00% <ø> (ø)
src/ruleset.hpp	69.23% <ø> (ø)
src/ruleset_builder.cpp	56.71% <40.00%> (ø)
src/context.cpp	61.53% <100.00%> (ø)
src/exclusion/input_filter.cpp	80.76% <100.00%> (ø)
src/exclusion/rule_filter.cpp	80.76% <100.00%> (ø)

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[cataphract]

Looks good, just wonder if some/all of the rule * can be made const rule *.