Added imgui and an option to inject source files into dependant projects.

recipes/SDL/recipe.py

@@ -1,4 +1,5 @@
 
+import os
 from SCons.Script import *
 
 def cook(env: Environment, git_ref: str = "main") -> dict:
@@ -10,7 +11,7 @@ def cook(env: Environment, git_ref: str = "main") -> dict:
     }.get(env['BUILD_TYPE'], 'SDL2')
     return {
         'LIBPATH': build_result['LIBPATH'],
-        'CPPPATH': build_result['CPPPATH'],
+        'CPPPATH': [os.path.join(build_result['install_dir'], 'include/SDL2')], # SDL is really weird about include paths ...
         'LIBS': [lib_name]
     }