Shadow, Alpha, Sharpness modules, Safari support, offline caching improvements

Notes in #2036 and #1751

Added

• New Shadow Module: Add shadows (borders) to images in bulk! #1507 by @niravasher
• New Alpha masking module: #1546 by @blurry-x-face
• New sharpness module in #1612 by @waridrox

Fixed

• compiled /dist/ files from v3.7.0
• Percentage Parsing: Percentage values passed to the sequencer are now parsed more consistently. (#1733)
• Safari Fix: Image Sequencer will now work in the Safari browser! (#1740)
• offline caching improvements in #1819 and -#1807 by @vivek-30
• variety of other bugfixes!
• fixed Module selector console error #1543 by @ss62171

Changed

• switch to GitHub Actions in #1783 (team effort!)
• switch to expr-eval in #1729 by @jywarren
• CLI improvements in #1785 by @blurry-x-face
• dependencies updated
• yarn.lock removed #2035