Added descriptions mapping for LuaScript packages' hooks.

In "ToDoxHook.lua":
- Added "getCurrentDirectory" function;
- Added process to fetch and map C++ headers' descriptions to Lua elements;
- [TODO] Write descriptions from Lua elements for Doxygen output.

In "ToZerobraneStudioHook.lua":
- Writes descriptions from Lua elements for ZerobraneStudio API file.