Constrain/clamp per-pixel mesh size to [8,300] and even values. #737
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The per-mixel mesh size needs to be a mutiple of two to avoid "bars" being rendered in each axis if the resolution is an odd number.
Also now clamping the value range from 8 to 300 (inclusive) on each axis, with 300 being well above anyone would need (Milkdrop's default of 64x48 is totally sufficient even in 4K).
The third commit just fixes a few compiler warnings by making the casts explicit.