Piskel v0.10.1

Intermediary release.
Most importantly includes a fix for the chromebook zoom bug #651

Features

• #659 [desktop] show confirm dialog before leaving
• #623 pick a color using alt + click

Bug Fixes & improvements

• #651 [chromebook] fix bug where the drawing area turns grey when zooming
• #628 fix arrow characters badly displayed in the cheatsheet by @zoeesilcock
• #641 fix various XSS issues
• #654 fix a memory leak issue in the frame list

Check the full changelist at : juliandescottes/piskel@v0.10.0...v0.10.1