Grid Map Editor

Changes the code so that it will compile

Made some changes that the code will compile and will start with UE5.6

• Fair Warning: This is a C++ plugin for UE5.6

Original Comment:

DROPPING SUPPORT FOR THIS BECAUSE UE5'S MODELLING TOOLS ARE MUCH BETTER

• Fair Warning: This is a C++ plugin for UE4

This is still very work in progress, but feel free to check it out.

Example video: https://www.youtube.com/watch?v=39XaiQew2Sk