v2.0.3: compiler warning fixes #3187
                
     Merged
            
            
          
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A variety of compiler warning fixes, most of which are unique to the v2.0.x branch.
At least one was in common with master (the memory/patcher fix), which was cherry picked from a commit in #3185.
I did not check to see if there were commits on master that fixed the other warnings; I just fixed them directly here on v2.0.x (it did not seem worth the spelunking effort).
@hppritcha Please review.