Error fixes, default objects, method updates

[Bugfix] Updated the InputField methods to their current versions
(.value changed to .text, .onSubmit to .onEndEdit)

[Update] Updated depricated GConsole.GetSuggestions to
GConsole.GetSuggestionItems, accordingly changed List<String> sugstrings
to List<GConsoleItem> sugitems

[Bugfix] Assigned references in GConsoleCanvas prefab and its children
to what they should be.

[Consistency] Changed the GConsoleCanvas object in the test scene to the
(updated) prefab.

[Organization] Made prefabs of the UI Camera and Event System and put
those plus the GConsoleCanvas prefab in a folder titled Default. Updated
ReadMe accordingly (actually adding a section which explained how to add
it to the scene).