cleanup global variables

[stevenhoving]

The entire code base is riddled with global variable to keep track of 'state'.

• [x] Add g_ prefix all the global's.
• [x] Move globals into structs and create a single runtime model to store them.

[stevenhoving]

In progress, but mainly on the side. Because everything has been copy pasted everywhere its hard to see its head or tail.

[stevenhoving]

completed