Issue Summary

Many of the icons in this software frankly feel outdated and they're not even in svg. Also, they don't look like they have the same design philosophies.

Expected Results

The icon would be better than they currently are now and will look like they are made with the same design principles.

Video or Image Reference

Steps to reproduce

1. Open the app
2. Look at the icons

System Information

• Pencil2D Version:
  0.61.1

• Operating System:
  elementaryOS Hera 5.1

• RAM Size:
  16 GB

• Graphics Tablet:
  None