Release v0.50.0

What's Changed

• feat(core): support shape align by @WBbug in #695
• feat(common): support distribute by @WBbug in #696
• fix(common): setTextAlign deletes useless parameters by @Maple13 in #697
• refactor(core): remove x-plait-fragment key and use text/html as stan… by @pubuzhixing8 in #699
• feat(core): add navigator.clipboard handle #WIK-4306 by @huanhuanwa in #700
• refactor(core): uniformly handle clipboard data and add parameter for setFragment and insertFragment #WIK-14309 by @huanhuanwa in #701

Full Changelog: v0.47.0...v0.50.0