Feature/Community Node

[HenryHengZJ]

• add a new flag: SHOW_COMMUNITY_NODES, when set to true, will display nodes created by community
• community node is differentiated by the author. For instance, if a node has the author specified, it is a community node

class SomeNode implements INode {
    ...
    author: string

    constructor() {
        ....
        this.author= 'Some User'
    }
}