for now the split view will always be on NewGui builds a new gui handler.

OverlappingEdges determines if panel edges overlap.

Binding - a keybinding mapping a key and modifier to a handler.

Gui wraps the gocui Gui object which handles rendering and events.

SentinelErrors are the errors that have special meaning and need to be checked by calling functions.

Teml is short for template used to make the required map[string]interface{} shorter when using gui.Tr.SLocalize and gui.Tr.TemplateLocalize.