Fix compile error on 4.10

[cpburnz]

When compiling UE4Editor v4.10, I get the following error:

[602/792] Compile Module.SublimeTextSourceCodeAccess.cpp
In file included from /mnt/data/home/caleb/Downloads/UnrealEngineTest/Engine/Plugins/Developer/SublimeTextSourceCodeAccess/Intermediate/Build/Linux/x86_64-unknown-linux-gnu/UE4Editor/Development/SublimeTextSourceCodeAccess/Module.SublimeTextSourceCodeAccess.cpp:2:
In file included from /mnt/data/home/caleb/Downloads/UnrealEngineTest/Engine/Plugins/Developer/SublimeTextSourceCodeAccess/Source/SublimeTextSourceCodeAccess/Private/SublimeTextSourceCodeAccessModule.cpp:24:
/mnt/data/home/caleb/Downloads/UnrealEngineTest/Engine/Plugins/Developer/SublimeTextSourceCodeAccess/Source/SublimeTextSourceCodeAccess/Private/SublimeTextSourceCodeAccessModule.h:35:36: error: field type 'FSublimeTextSourceCodeAccessor' is an abstract class
    FSublimeTextSourceCodeAccessor SublimeTextSourceCodeAccessor;
                                   ^
Developer/SourceCodeAccess/Public/ISourceCodeAccessor.h:18:15: note: unimplemented pure virtual method 'RefreshAvailability' in 'FSublimeTextSourceCodeAccessor'
        virtual void RefreshAvailability() = 0;
                     ^
In file included from /mnt/data/home/caleb/Downloads/UnrealEngineTest/Engine/Plugins/Developer/SublimeTextSourceCodeAccess/Intermediate/Build/Linux/x86_64-unknown-linux-gnu/UE4Editor/Development/SublimeTextSourceCodeAccess/Module.SublimeTextSourceCodeAccess.cpp:2:
/mnt/data/home/caleb/Downloads/UnrealEngineTest/Engine/Plugins/Developer/SublimeTextSourceCodeAccess/Source/SublimeTextSourceCodeAccess/Private/SublimeTextSourceCodeAccessModule.cpp:26:1: error: cannot initialize return object of type 'IModuleInterface *' with an rvalue of type 'FSublimeTextSourceCodeAccessModule *'
IMPLEMENT_MODULE( FSublimeTextSourceCodeAccessModule, SublimeTextSourceCodeAccess );
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Runtime/Core/Public/Modules/ModuleManager.h:683:11: note: expanded from macro 'IMPLEMENT_MODULE'
                        return new ModuleImplClass(); \
                               ^~~~~~~~~~~~~~~~~~~~~
2 errors generated.

ISourceCodeAccessor appears to have a new unimplemented virtual method:

virtual void RefreshAvailability() = 0;

The NullSourceCodeAccess implementation simply defines the method as:

virtual void RefreshAvailability() override { }

Adding this method to FSublimeTextSourceCodeAccessor fixes the issue, and compiles properly. NOTE: This fix will likely cause SublimeTextSourceCodeAccess to fail to compile on earlier versions of UE4Editor because the new method is overridden.

[erbridge]

Thanks :).