Some missing explicit inclusions and namespaces

[Hapaxia]

In some (mainly older) drawables, there is some usage of a standard library without any explicit inclusion of that library. There are also some occasions where the calling of functions from these libraries do not specify their specific namespace and are called from global scope.

This may compile okay using some compiler due to the automatic and implicit inclusion of these libraries by certain compilers but will not compile with all. To stay cross-platform, this should be rectified.