Implement event handler

Added event handler implementation.
Moved enginge specific implementation outside graphics module

Signed-off-by: Piotr Krygier <piotrkrygier@everyonecancode@xyz>

events/meson.build

@@ -1,4 +1,5 @@
 rse_events_sources = [
+  'src/events_manager.c'
   ]
 
 sdl3_dep = dependency('sdl3',
@@ -10,7 +11,7 @@ rse_events_lib = shared_library(
   include_directories : [
     '../'
     ],
-  dependencies : [
+  dependencies : [sdl3_dep,
                   ],
   link_with: rse_utilities_lib,
   install : true