Added a compiler error if your compiler is too old and removed numerous code checks for old compilers which are now deprecated

modules/juce_audio_basics/midi/juce_MidiMessage.cpp

@@ -285,7 +285,6 @@ MidiMessage& MidiMessage::operator= (const MidiMessage& other)
     return *this;
 }
 
-#if JUCE_COMPILER_SUPPORTS_MOVE_SEMANTICS
 MidiMessage::MidiMessage (MidiMessage&& other) noexcept
    : timeStamp (other.timeStamp), size (other.size)
 {
@@ -301,7 +300,6 @@ MidiMessage& MidiMessage::operator= (MidiMessage&& other) noexcept
     other.size = 0;
     return *this;
 }
-#endif
 
 MidiMessage::~MidiMessage() noexcept
 {

modules/juce_audio_basics/midi/juce_MidiMessage.h

@@ -115,10 +115,11 @@ public:
     /** Copies this message from another one. */
     MidiMessage& operator= (const MidiMessage& other);
 
-   #if JUCE_COMPILER_SUPPORTS_MOVE_SEMANTICS
+    /** Move constructor */
     MidiMessage (MidiMessage&&) noexcept;
+
+    /** Move assignment operator */
     MidiMessage& operator= (MidiMessage&&) noexcept;
-   #endif
 
     //==============================================================================
     /** Returns a pointer to the raw midi data.

modules/juce_audio_basics/midi/juce_MidiMessageSequence.h

@@ -54,17 +54,17 @@ public:
     /** Replaces this sequence with another one. */
     MidiMessageSequence& operator= (const MidiMessageSequence&);
 
-   #if JUCE_COMPILER_SUPPORTS_MOVE_SEMANTICS
+    /** Move constructor */
     MidiMessageSequence (MidiMessageSequence&& other) noexcept
         : list (static_cast<OwnedArray<MidiEventHolder>&&> (other.list))
     {}
 
+    /** Move assignment operator */
     MidiMessageSequence& operator= (MidiMessageSequence&& other) noexcept
     {
         list = static_cast<OwnedArray<MidiEventHolder>&&> (other.list);
         return *this;
     }
-   #endif
 
     /** Destructor. */
     ~MidiMessageSequence();