[drape] Removed fixed text size in favor of always using SDF fonts

[biodranik]

Fixed size was a case only for some older mdpi devices (likely to look a bit better). SDF fonts allow dynamic resizing to any desired size without loss of quality. And each glyph should be rendered only once on the texture.

Preparation for #4281

[pastk]

Looks good on my mdpi screen, better than before!

Now there are much less boggled fonts cases like this:

Now this is the worst case I was able to spot

Also the labels seem to be somewhat more contrast now and the min font size is smaller now.

[biodranik]

@pastk your screen is mdpi, right? Are there any before/after screenshots?

[pastk]

Yeap its mdpi, this PR produces smaller, more condensed and less blurry fonts:

[biodranik]

Can you please test if visual quality of fonts changes when you edit this parameter:

    uint32_t m_sdfScale = 4;

to 1, 2, 8, 16, 32?

And also check how uint32_t m_baseGlyphHeight = 22; influences the quality too? Maybe try 18, 24, 28, 32?

[biodranik]

@pastk sorry, the correct place to modify these constants is here:

uint32_t VisualParams::GetGlyphSdfScale() const
{
  ASSERT_INITED;
  return (m_visualScale <= 1.0) ? 3 : 4;
}

uint32_t VisualParams::GetGlyphBaseSize() const
{
  ASSERT_INITED;
  return 22;
}

[pastk]

GlyphSdfScale is best with 3 (the default) or 4 (I like it a bit more). The difference is very subtle anyway. (2 is too blurry, 8 is too coarse like there is no AA at all).

GlyphBaseSize is the best with default 22. I won't change it.