Added base events module

Added first version of events module.
Needs modifications & tests.
Events: finished doc for functions
Moved thing in osc which wasn't at the right place
Various fixes
Added SDL12 define condition in SDL12 ui module
Events: implementation of actions
Makefile: updated version name
Events: base sdl ui wrapper function
Events: added main oscillo switches for SDL ui
Events: osc main key bindings + scan
Key bindings description
Events: fillscreen switch added+implemented scan eat

Implemented scan_eat_column and scan_eat_line
Added event fillscreen for switching between fillscreen mode and normal refresh
Events: added fillscreen & eat bindings
Help: added hint for using --help on each mode
Fixed typo
GlobalUI: first version
GlobalUI: fixed typos
GlobalUI: Filled header with functions

Got function list from SDL12 ui.
TODO: implement these functions to call the actual ones, depending on the real UI used
TODO: replace all instances of ui_sdl_* with ui_glob_* equivalents
GlobalUI: Implemented functions
GlobalUI: implemented in osc module