Version 1.0.2 - Unity security vulnerability patch + fixed bugs

Just a minor update because Unity discovered a security vulnerability that affects games built on Unity versions 2017.1 and later. Before rebuilding, I decided to fix some bugs as well.

Changes in this update:

• New secure build with the patched Unity version
• Fixed bug – multiple selection delete bug
• Fixed bug - save shortcut closes right menu bug
• Fixed bug - multiple selection snap to pixel bug