Remove old suppressions

This includes commented out suppression, and obselete ones

buildconfig/CMake/CppCheck_Suppressions.txt.in

@@ -20,27 +20,11 @@ noConstructor
 // Pre-processor Directives, such as #error, which are upstream anyway
 preprocessorErrorDirective
 
-// ---------- cppcheck 1.90 Transition -------
-unmatchedSuppression
-
 // If-init not supported
 syntaxError:${CMAKE_SOURCE_DIR}/Framework/API/src/MatrixWorkspace.cpp
 
-// --- To be added back ------
-//cstyleCase:*${CMAKE_SOURCE_DIR}/MantidPlot
-
-// A large number of copying instead of pass by ref were picked up by clang-tidy, but around 200 remain
-//passedByValue
-
 // Cppcheck struggles with some inheritance chains, some of these might be true though
 unusedPrivateFunction
-
-// Nice to have, not need to have at the moment
-//useInitializationList
-
-// Libs we have in-source
-// *:${CMAKE_SOURCE_DIR}/Framework/DataObjects/inc/MantidDataObjects/MortonIndex/*
-
 // ---------- Individual suppressions -----------------
 
 pureVirtualCall:${CMAKE_SOURCE_DIR}/qt/scientific_interfaces/Indirect/IndirectBayesTab.cpp