[HTML5] Better editor HTML, small refactor.

Side and GDNative libraries are now added by engine.js , the dynlink pre
js had been deleted.

platform/javascript/detect.py

@@ -1,7 +1,14 @@
 import os
 import sys
 
-from emscripten_helpers import run_closure_compiler, create_engine_file, add_js_libraries, add_js_pre, add_js_externs
+from emscripten_helpers import (
+    run_closure_compiler,
+    create_engine_file,
+    add_js_libraries,
+    add_js_pre,
+    add_js_externs,
+    get_build_version,
+)
 from methods import get_compiler_version
 from SCons.Util import WhereIs
 
@@ -58,7 +65,6 @@ def configure(env):
             sys.exit(255)
 
     ## Build type
-
     if env["target"] == "release":
         # Use -Os to prioritize optimizing for reduced file size. This is
         # particularly valuable for the web platform because it directly
@@ -142,6 +148,9 @@ def configure(env):
     env.AddMethod(add_js_pre, "AddJSPre")
     env.AddMethod(add_js_externs, "AddJSExterns")
 
+    # Add method for getting build version string.
+    env.AddMethod(get_build_version, "GetBuildVersion")
+
     # Add method that joins/compiles our Engine files.
     env.AddMethod(create_engine_file, "CreateEngineFile")