Log Message:
Update to sile-0.14.8:

Some highlights:
- support for font variations
- optional language-specific sorting rules for tables
- dependency tracking
- code block environment, raw handler for autodoc
- make leading zeros optional for counters
- improved hyphenation for Turkish
- allow page selection when using PDFs as images
- allow customization of otherwise empty filler pages
- extend postamble functionality to be symmetric to preambles
- allow evaluating lua code after input processing via cli
- new l10n support (Russia, Norwegian)