Change how new node is created in forms in Architect

[xchen0326]

Step 1. change the text field that was used for users to input their new node names to be a radio group
Step 2. create association between pre-entered node names and their corresponding icons (e.g. a node named 'Person' will automatically be linked to an icon that has a human face on it)
Step 3. allow customized node name inputs if users do not find anticipated pre-entered node names and provide more icons to choose
Step 4. add search feature for the pre-entered node names