Prepare for event system

Moved stuff around.
Create an entry point for RSE.
Created base for events module

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

events/meson.build

@@ -0,0 +1,17 @@
+rse_events_sources = [
+  ]
+
+sdl3_dep = dependency('sdl3',
+                      version : '>=3.4.0')
+
+rse_events_lib = shared_library(
+  'rse_events',
+  rse_events_sources,
+  include_directories : [
+    '../'
+    ],
+  dependencies : [
+                  ],
+  link_with: rse_utilities_lib,
+  install : true
+  )