JFrame (MainApplet -> MainPanel), tags, font size

- Program uses a JFrame now
- MainApplet is now MainPanel, which has a main method that creates a
JFrame
- Tags are fully supported (we read from tags.txt)
- Drawing text in nodes supports multiple font sizes
- I was still getting browser crashes, but I commented out a line in
sidePanel.java and the crashes stopped
- Got rid of all of the compiler warning messages I was getting