- Some functions that took integer arguments for proxy size enums; make
them take said enums directly.
- Add get_render_scale_factor() that calculates effective render scale,
use that in places that did manual "use either scene render scale setting
or proxy size" calculation in 5 places.
- Replace previous double with float in proxy size scale factors; all
the factors are exactly representable as floats, and all the calling
places used them as floats too.
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