Use boost::filesystem::path for all paths, and std::string for all other
strings, converting to/from wxString as close to the actual uses of wx
as possible.
Where possible, replace the uses of non-UI wxWidgets functionality with
the additions to the standard library in C++11, or the equivalents in
boost.
Move the path token management logic to libaegisub (and rewrite it in
the process).
Add a basic thread pool based on asio and std::thread to libaegisub.
This touches nearly every file in the project and a nontrivial amount of
code had to be rewritten entirely, so there's probably a lot of broken
stuff.
Consistently use the C++ names for headers rather than a combination of the
C and C++ names.
Remove empty LAGI_PRE blocks.
Remove checks for both AGI_PRE and LAGI_PRE and change a check for only
AGI_PRE to LAGI_PRE.
Originally committed to SVN as r5516.
