Implemented basic console variable support

[ChunkTreasure1]

Implemented basic console variable support. Should be created in global scope, can be referenced in other compilation units using a reference

Usage:

static ConsoleVariable<int32_t> s_testCVar = ConsoleVariable<int32_t>("r.test", 0, "Test Variable");

...

auto testValue = s_testVar.GetValue();
s_testVar = 4;

References should only be declared in functions/methods (for now)
Reference Usage:

void TestFunc()
{
    static ConsoleVariableRef<int32_t> testCVarRef = ConsoleVariableRef<int32_t>("r.test");

    // Usage the same as original value.
}

[Cooltomten]

Looks good, I personally dont like the creation of a static variable inside of a function that is not called all the time as it is never removed after the function has been called once, but as long as it is used responsively it is fine