[libcalamares] Remove Typedefs.h

- This small header file contained a few unrelated typedefs.
   Move those typedefs to the classes they relate to. This
   **does** mean that some consumers need to #include something
   else instead.
 - Use type names more consistently.

Editorial: why are **pages** responsible for creating the jobs?

src/modules/partition/core/PartitionCoreModule.cpp

@@ -50,7 +50,6 @@
 #ifdef DEBUG_PARTITION_LAME
 #include "JobExample.h"
 #endif
-#include "Typedefs.h"
 #include "utils/Logger.h"
 
 // KPMcore