SAPI: Track last executed mod and include in error messages

builtin/game/auth.lua

builtin/game/chatcommands.lua

builtin/game/detached_inventory.lua

builtin/game/item.lua

builtin/game/misc.lua

builtin/game/register.lua

src/script/common/c_internal.cpp

src/script/common/c_internal.h

src/script/cpp_api/s_base.cpp

src/script/cpp_api/s_base.h

src/script/cpp_api/s_entity.cpp

src/script/cpp_api/s_env.cpp

src/script/cpp_api/s_inventory.cpp

src/script/cpp_api/s_item.cpp

src/script/cpp_api/s_player.cpp

src/script/cpp_api/s_server.cpp

src/script/lua_api/l_env.cpp

src/script/lua_api/l_server.cpp

src/script/lua_api/l_server.h