[Lazarus] Hi-dpi icons suggestion

[Alexey]

I have suggestion for scaling hi-dpi for Speedbuttons with icons
Now: icons scale by any scale, e.g. by 175% if OS scale is 175%
It looks bad for 16x16 ide icons. they are looking broken.
Suggestion:
- until scale <200%, don't zoom icons, paint 16x even on bigger buttons
- scale is >=200%, <300%, then zoom icons 2x times
- scale is >=300%, then zoom icons 3x times

(Can add prop, to keep /bad look/ on 175%)

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Regards,
Alexey T.