[Scons] Implement module dependency sorting.

Modules can now call:

env.module_add_dependencies(name: str, deps: list, optional: bool)

To add required or optional dependencies during the "can_build" step.

Required dependencies will be checked and the module will be not be
enabled when they are missing, printing a warning to notify the user.

SConstruct

@@ -138,6 +138,7 @@ env_base.__class__.CommandNoCache = methods.CommandNoCache
 env_base.__class__.Run = methods.Run
 env_base.__class__.disable_warnings = methods.disable_warnings
 env_base.__class__.force_optimization_on_debug = methods.force_optimization_on_debug
+env_base.__class__.module_add_dependencies = methods.module_add_dependencies
 env_base.__class__.module_check_dependencies = methods.module_check_dependencies
 
 env_base["x86_libtheora_opt_gcc"] = False
@@ -699,6 +700,7 @@ if selected_platform in platform_list:
     sys.modules.pop("detect")
 
     modules_enabled = OrderedDict()
+    env.module_dependencies = {}
     env.module_icons_paths = []
     env.doc_class_path = {}
 
@@ -710,6 +712,10 @@ if selected_platform in platform_list:
         import config
 
         if config.can_build(env, selected_platform):
+            # Disable it if a required dependency is missing.
+            if not env.module_check_dependencies(name):
+                continue
+
             config.configure(env)
             # Get doc classes paths (if present)
             try:
@@ -732,6 +738,7 @@ if selected_platform in platform_list:
         sys.modules.pop("config")
 
     env.module_list = modules_enabled
+    methods.sort_module_list(env)
 
     methods.update_version(env.module_version_string)
 
@@ -794,15 +801,6 @@ if selected_platform in platform_list:
     if env["minizip"]:
         env.Append(CPPDEFINES=["MINIZIP_ENABLED"])
 
-    editor_module_list = []
-    if env["tools"] and not env.module_check_dependencies("tools", editor_module_list):
-        print(
-            "Build option 'module_"
-            + x
-            + "_enabled=no' cannot be used with 'tools=yes' (editor), only with 'tools=no' (export template)."
-        )
-        Exit(255)
-
     if not env["verbose"]:
         methods.no_verbose(sys, env)