Generate symbol.hpp headers.
Added macros for explicit function/class instantiations.
Fixed a warning in variant on x86.
Install FcpptSymbol.cmake
Added conditional SYSTEM includes.
Use BOOST_{FILESYSTEM,SYSTEM}_NO_DEPRECATED everywhere.
Added mpl::integral_cast and really fixed x86 variant warnings.
Updated convenience headers.
Updated export documentation.
Documentation fixes, added a new signal benchmark example
Complete documentation for fcppt::signal.

Fixes gh-18
Fixed a typo in the export docu.
Documented homogenous_pair.
Fixed the fcppt version in the documentation.
Added documentation for mpl::append and added mpl::print.
Some initial mpl documentation.
Fixed typo in mpl::exception documentation.
Fixed two typos in the documentation, by Mario Lang.
Finished mpl documentation.
Removed fcppt::utf8.

It was based on the codecvt facet from boost that converts char
sequences of utf-8 to sequences of wchar_ts. However, it internally
requires that a wchar_t's encoding is ucs-4, so this is not portable.