Refactored relative input
Added keyhandling
Added proper surface handling with a cursor
Merge pull request #319 from TheNeikos/add-mouse_clicks

Add mouse clicks
Add deserializer callback interface
Add deserializer callback source file (stubs) and CMakeLists.txt entry
Add implementation for NULL callback
Add implementation for boolean callback
Add implementation for integer callback
Add implementation for string callback
Add implementation for start_map callback
Add implementation of map_key callback
Add implementation of end_map callback
Add implementation of start_array callback
Add implementation of end_array callback
Set callback table
Add key for stack position argument type
Add state for stack position argument type state
Initial json deserializer testing setup
Add test for init/deinit deserializer