Changed main class to make use of Settings class

Since a Settings class has been added, the main class (the one with
setup()) has been changed so that it actually uses the Settings class to
determine port numbers and the number of cameras (instead of hardcoding
it).
Added Settings class

Added a static class that stores all the settings. How exactly this is
populated is yet to be determined.
Added Slot class

Added a class to store the data associated with a storage slot. For now
it just wraps the File that it is associated with. Later it will/may
have functionality to read and write the wrapped file.
Merge branch 'development' of https://github.com/Threepud/Sketchup-Blocks into development