allow cfg(one_screenshot) and static_mut_refs warnings
          #879
        
          
      
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Fixes #823.
Allows
#[cfg(one_screenshot)]internally without making it publicly acessible as it is only a debugging utility.Allows
static_mut_refsbecause macroquad 0.4 is fundamentally built as a single-thread library with a centralstatic mut CONTEXTand this lint cannot be fixed without larger changes.