redesigned frontend

src/main/java/edu/mit/blocks/codeblockutil/CQueryField.java

src/main/java/edu/mit/blocks/codeblockutil/GlassCard.java

...main/java/edu/mit/blocks/codeblockutil/GlassExplorer.java

src/main/java/edu/mit/blocks/workspace/BlockCanvas.java

src/main/java/edu/mit/blocks/workspace/FactoryManager.java

src/main/java/edu/mit/blocks/workspace/SearchBar.java

src/main/java/edu/mit/blocks/workspace/Workspace.java