add combobox for selecting node & improve ui components

...i/src/main/java/com/joelhelkala/watcherGui/Node/Node.java

...n/java/com/joelhelkala/watcherGui/frames/WelcomePage.java

...joelhelkala/watcherGui/frames/subframes/FriendsFrame.java

...oelhelkala/watcherGui/frames/subframes/NodeDataFrame.java

...elkala/watcherGui/frames/subframes/NodeSettingsFrame.java

...com/joelhelkala/watcherGui/httpRequests/HttpRequests.java