Resolve majority of clang+libstdc++ warnings

src/logid/actions/Action.h

@@ -63,6 +63,8 @@ namespace actions {
 
         virtual uint8_t reprogFlags() const = 0;
 
+        virtual ~Action() = default;
+
         class Config
         {
         protected:

src/logid/actions/gesture/Gesture.h

@@ -31,7 +31,7 @@ namespace actions
         explicit InvalidGesture(std::string what="") : _what (what)
         {
         }
-        virtual const char* what()
+        virtual const char* what() const noexcept
         {
             return _what.c_str();
         }
@@ -49,6 +49,8 @@ namespace actions
         virtual bool wheelCompatibility() const = 0;
         virtual bool metThreshold() const = 0;
 
+        virtual ~Gesture() = default;
+
         class Config
         {
         public: