Fix/Suppress remaining Cppcheck warnings (#291)

Fix/suppress the following cppcheck warnings:

* arithOperationsOnVoidPointer
* uninitMember
* const*
* shadowVariable
* assignmentIntegerToAddress
* containerOutOfBounds
* pointer-related warnings in Ragel source
* missingOverride
* memleak
* knownConditionTrueFalse
* noExplicitConstructor
* invalidPrintfArgType_sint
* useStlAlgorithm
* cstyleCast
* clarifyCondition
* VSX-related cstyleCast
* unsignedLessThanZero 

Furthermore, we added a suppression list to be used, which also includes the following:
* missingIncludeSystem
* missingInclude
* unmatchedSuppression

unit/internal/multi_bit.cpp

@@ -55,11 +55,11 @@ public:
     }
     operator u8 *() {
         assert(data);
-        return data.get() + 7;
+        return reinterpret_cast<u8 *>(data.get()) + 7;
     }
     operator const u8 *() const {
         assert(data);
-        return data.get() + 7;
+        return reinterpret_cast<u8 *>(data.get()) + 7;
     }
 
 private: