Add more node edit features

[SamuelmdLow]

• Be able to add node images in inspector
• Allow editting shape, colour, boldness, manually fix mass,

[SamuelmdLow]

Users should be able to give nodes attribures
eg)
translation: hello
colour code: #00ff00

Sometimes you want quizable information but don't want the graph to get messy by including a node for the relationship. This will address that!