The idea is to allow users to define their own commands using Lua.
The builtin command Find is now written in Lua.
This commit also fixes a bug in the get_formatter() Lua API.
It also adds String arguments to macros.
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
(optional) Boost (version >= 1.54), we can
build Lean using boost::thread instead of std::thread. When using
Boost, Lean can modify the thread stack size.