EPUBCheck 5.0 preview for EPUB 3.3

[jhowell]

EPUBCheck is now up to version 5.0.1.

Features

• allow "pageBreakSource" package metadata (incubation) (2332d53), closes #1491
• allow epub:type on SVG renderable elements (6cd9789), closes #1497

Bug Fixes

• allow ARIA headings in EDUPUB (legacy profile) (da4f541), closes #1483
• allow decimal viewport dimensions in fixed-layout (fc5e360), closes #1481
• allow nav items containing multiple images (3c8dab3), closes #1476
• allow remote URLs in HTML "cite" attributes (1b425fd), closes #1495
• allow the 'cover-image' property on WebP images (199da0b), closes #1484
• bad message parameter formatting in CSS-004 and RSC-028 (0f0cece), closes #1480
• do not check fragment identifiers on PDF references (b81a77d), closes #1482
• items were listed twice and/or with null values in the JSON report (b2c5d8c), closes #1475 #1490
• normalize URLs before checking if the resources exist (0323668), closes #1479
• support UNC paths (fix URL/File conversions) (6e5b791), closes #1485