Sigil

Sigil 2.8.5 is a mixture of bugfixes and new features. ### New Features - remove outdated CSS parser and replace it with a modern spec-compliant Lexbor based css parser. See https://github.com/lexbor/lexbor. Note: Required upstream changes have been approved but are waiting to be merged until other changes requiring a major update are needed (ie size of parser and tokenizer structures needed to grow breaking the ABI). So do *NOT* replace our internal version of lexbor with a released lexbor version as it will currently not work. We will keep it internal with our own patches and statically linked to prevent dll issues until those requested changes are properly upstreamed. - improve bulk addition speed of AddExisting/Drop Zone when replacing already existing images by directly using file write with truncation and thereby never touching the opf - speed up Bookbrowser Refresh by bulk adding and removal items. (contributed by rinne1998) - try to allow Sigil dock recent items on macOS platform - allow multiple selection in the TOC Editor to speed larger changes. - add image initial size to Sigil's Image tab. - add ability to create your own Insert Special Characters dialog us