Remove unuseful typedefs in SCT_Monitoring package

• Remove unuseful typedefs in SCT_Monitoring package. To enable easy changing of types

typedef TH1F* H1_t;

was defined. But

H1_t tmp{new TH1F{name.c_str(), title.c_str(), nbins, lo, hi}};

was used to create a new object. The gain of the typedef is limited and the code is less clear. Many people know TH1F* but H1_t.

• Use override final instead of final or override
• Remove unnecessary includes and forward declarations
• Remove std:: if using namespace std is used.

https://its.cern.ch/jira/browse/ATLASDQ-679