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(cherry picked from commit 61abac9b)
(cherry picked from commit c50e4ebe)

(cherry picked from commit 61abac9b)

* Require CMake 3.13.
* Add DISABLE_BC_PACKAGE_SEARCH hidden variable.
* Export belr target on configure stage only when LINPHONE_BUILDER_GROUP feature is on.

(cherry picked from commit 7cc6f43a)
(cherry picked from commit fda28381)

Add in tester an example of an API that uses inheritance, with a base class used to represent several kind of different elements.
Remove a useless usage shared_ptr<> in the Parser and Regognizers. This should increase a bit the parsing performance.

Add corresponding test.

Fix bug with the use of createRootObject(). It wasn't passed the size of what was really parsed, which was confusing for the DebugParser and the output of belr-parse tool.

This option makes the creation of 'package_source' custom target optional,
allowing to build with CMake < 3.11 if it is disabled (default).

(cherry picked from commit 6b63669f)

Fix rpm.

See merge request !12

Clarify informative files, better documentation, relicensed to GPLv3.

See merge request !11

Feature/reduce template code size

See merge request !7

Replace some shared_ptr by unique_ptr. These pointers were not really shared, but rather managed into a single object.
This change allows to significantly reduce the object code generated. Belcard library has been reduced by a factor of 2.5.

Reduce object code generated by templates. This leads a 50% reduce in belcard library as an example (debug symbol stripped).

Fix build issues with Visual Studio 2017

See merge request !6

make framework on macos

See merge request !5