rttrorg / rttr / 717
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Add new library class (#116)

* This adds the functionatliy to load libraries in a simple cross plattform way.
The native OS calls are wrapped behind a class interface.

Highlights:

- handling of file suffixes (.dll or .so)
- automatic unload of library on program exit
- etrieving of loaded types in library
- avoid of unncessary loading calls, when same plugin is loaded multiple times

additional:

- added unit tests
- added example of loading a plugin
- added a small tutorial how do develop plugins with RTTR

Development notes:

* fixed invalid memory access under MacOSX with clang

Actually the problem was also present under linux, (with gcc or clang).
This situation was following:
1. A plugin was loaded with type "int[100]" and registered
2. The plugin was unloaded => "int[100]" was removed from the type system and deleted
3. The type[100] was used in the unit_test later and was accessing the memory
of the already deleted type_data

The reason for this behavior lies in the usage of local static member variables
(which is used to cache the retrieving and registering of type_data information).
This variable was process wide unique, this lead to problems when unloading a plugin.
The static was no reinitialized when unloading the plugin.
So the variable was pointing to type_data information which was alreadyl deleted.

Now we are using RTTR_LOCAL to hide the symbols for exporting. This fixes the issues.

5726 of 6200 relevant lines covered (92.35%)

3704.39 hits per line

Jobs
ID Job ID Ran Files Coverage
3 717.3 (NAME="code coverage x86" COMPILER=g++-4.8 ARCH=x86 CONF=Debug GCOV_FLAGS='--coverage' UNIT_TESTS=true) 0
92.38
 Travis Job 717.3
4 717.4 (NAME="code coverage x64" COMPILER=g++-4.8 ARCH=x86_64 CONF=Debug GCOV_FLAGS='--coverage' UNIT_TESTS=true) 0
92.27
 Travis Job 717.4
Source Files on build 717
Detailed source file information is not available for this build.