beremiz

use nice and pretty mono font in graphical languages (SFC, FBD, LD) as well

it looks like that was original idea, but some bug squashed in and
default font was used for POU.

at the same time fix use of mono font in the header of Variable panel
for SFC/FBD/LD POUs.
include yslt.yml2
in xsl {
decl istylesheet (
*output="xml",
version="1.0",
xmlns:xsl="http://www.w3.org/1999/XSL/Transform",
xmlns:exsl='http://exslt.org/common',
extension-element-prefixes='exsl'
) alias stylesheet {
output *output;
content;
};
decl template(match) {
content;
};
decl function(name) alias template {
content;
};
decl call(name) alias call-template {
content;
};
decl apply(select) alias apply-templates {
content;
};
}