PayButton v4.0.0

Introduced support for alternative payment options (other currencies) via SideShift, added new 'contribution-offset' parameter (useful for fundraisers), updated to open Cashtab as a PWA if available, exposed input address(es) on tx callbacks, misc refactors + optimizations, & bug fixes.

What's Changed

• Fix/supported currencies by @lissavxo in #406
• refactor: add constant util by @lissavxo in #407
• refactor: add types util by @lissavxo in #409
• refactor: add number util by @lissavxo in #408
• Chore/add socket util by @lissavxo in #412
• Chore/add tests coverage by @lissavxo in #411
• Refactor/add currency util by @lissavxo in #410
• tests: replace util tests by @lissavxo in #413
• refactor: add index utils by @lissavxo in #405
• docs: rename can edit by @lissavxo in #416
• feat: paybutton generator dev by @lissavxo in #415
• feat: add build:dev script by @lissavxo in #414
• feat: sideshift integration by @chedieck in #418
• feat: sideshift integration pay by @chedieck in #419
• Feat/improve payment detected behavior by @lissavxo in #403
• fix: editable prop by @lissavxo in #423
• fix: amount missing bch qrcode by @lissavxo in #421
• Fix/disabled prop by @lissavxo in #424
• feat:enable altpayment prop by @lissavxo in #432
• [UI] Style edits to sideshift UI by @johnkuney in #431
• Feat/contribution offset prop by @lissavxo in #433
• chore: realocate, rename, uncommit config by @chedieck in #434
• Feat/add watch command by @lissavxo in #437
• Feat/generator render widgets by @lissavxo in #436
• Fix/op return fail by @lissavxo in #435
• Fix/disabled behavior by @lissavxo in #438
• fix: sideshift button not rendering by @chedieck in #439
• fix: sideshift fixed amount by @chedieck in #440
• fix: text empty nbsp by @lissavxo in #441
• fix: ws localhost port for demo button that uses localhost always by @chedieck in #446
• [UI]: Sideshift ui edits by @johnkuney in #447
• feat: add inputs to tx type by @lissavxo in #445
• fix: sideshift amount decimals by @lissavxo in #449
• Feat/mobile open cashtab by @lissavxo in #450
• ui: prevent disabled button on non editable amount sideshift by @johnkuney in #451
• ui: Make SideShift container same size as widget by @johnkuney in #456
• Feat/change enable altpayment disabled by @lissavxo in #457
• fix sideshift button when opacity 0 by @johnkuney in #458
• ui: fix fonts not coming through by @johnkuney in #459

Full Changelog: 3.0.2...4.0.0