Remove unused use statements
There are several files which have use statements that are unused.
[TASK] Remove unused use statements
Several classes include unused use statements. This patch removes those
statements or uses them in their code.
Reviewed-by: Alexander Opitz
Tested-by: Alexander Opitz
Reviewed-by: Oliver Klee
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters