Fix for RT #251846. Also makes some labels in many other PDF exports the 'right' colour (as the develoepr intended, at least, maybe not what the user expected!).
Fix for RT #251846. Also makes some labels in many other PDF exports the
'right' colour (as the develoepr intended, at least, maybe not what the
user expected!).

Issue was caused by first use of hex triples to specify a colour to render
text in regulation export. This led to broken PDFs.

Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-draw,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode