We now compute the cap-height from the rasterized glyph data. Moved the scaling action of use_cap_height_to_scale_fallback_fonts from glyphcache into the font resolver: when enabled, and we have data about the baseline font and the font being resolved, then the resolving font will be scaled such that the cap-height of both fonts has the same pixel size. The effect of this is that `I` glyphs from both fonts should appear to have the same height. Added a row of `I`'s in differing styles at the bottom of styles.txt to make this easier to visualize. refs: #1189