Editor code: tidy up BOOLs,NULLs and overrides pt5. (#2876)

A few 'typedefs' replaced by 'using's
This shouldn't have any functional changes at all, just c++17 modernization
It's a part 5 of a split #2847

Signed-off-by: Nemerle <nemerle5+git@gmail.com>

Co-authored-by: Nemerle <nemerle5+git@gmail.com>

Code/Editor/CryEditPy.cpp

@@ -359,7 +359,7 @@ namespace
             {
                 AZ::TickBus::Handler::BusConnect();
             }
-            ~Ticker()
+            ~Ticker() override
             {
                 AZ::TickBus::Handler::BusDisconnect();
             }