While .kvk includes a font color field, it is essentially unused. There
was also some sort of support provided for font style in the KeymanWeb
keyboard compiler, but this was never streamed into .kvk or .kvks files,
so was always a no-op.
Thus, this PR removes any semblance of support for font style and color
from the .kvk and .kvks readers and writers. When we write the font
color field which is present in .kvk, we always use the default
TColor.clWindowText which is what the legacy Delphi-based writer would
always have written.
Also sorted out the default font size and name in the .kvk transform
from .kvks, and in so doing cleaned up the basic.kvk and basic.js in
LDML keyboard compiler to match what we are doing in the .kmn compiler.
