Reorganize includes

[Flamefire]

• Add missing includes, closes #43, closes #30
• Remove an unncessary shared_ptr, see https://github.com/boostorg/locale/pull/43#issuecomment-545472796
• Reorganize include order so it is consistent and easier to understand:
  • public includes (include folder) include any <boost/locale/*> first. At least <boost/locale/config.hpp>
  • The first include in a cpp file is the corresponding header if any
  • Then <boost/locale/*>, <boost/*>, <*>, "*" in this order
  • Warning suppression pragmas come last where possible
  • Use the C++ headers where available (i.e. <cstring> not <string.h>)

Finally include the examples in the CMake builds to further check that compilation still works.

[codecov[bot]]

Codecov Report

Merging #85 (f61245a) into develop (2e566b8) will decrease coverage by 0.04%. The diff coverage is 85.71%.

@@             Coverage Diff             @@
##           develop      #85      +/-   ##
===========================================
- Coverage    79.94%   79.90%   -0.05%     
===========================================
  Files           76       76              
  Lines         5930     5917      -13     
===========================================
- Hits          4741     4728      -13     
  Misses        1189     1189              

Impacted Files	Coverage Δ
include/boost/locale/conversion.hpp	100.00% <ø> (ø)
include/boost/locale/date_time.hpp	91.42% <ø> (ø)
include/boost/locale/date_time_facet.hpp	100.00% <ø> (ø)
include/boost/locale/encoding.hpp	100.00% <ø> (ø)
include/boost/locale/encoding_errors.hpp	100.00% <ø> (ø)
include/boost/locale/encoding_utf.hpp	100.00% <ø> (ø)
include/boost/locale/formatting.hpp	61.26% <ø> (ø)
include/boost/locale/generator.hpp	100.00% <ø> (ø)
include/boost/locale/gnu_gettext.hpp	100.00% <ø> (ø)
include/boost/locale/hold_ptr.hpp	95.23% <ø> (ø)
... and 44 more

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