Option to enable cvtt and betsy compression in exported builds

modules/betsy/config.py

@@ -1,5 +1,17 @@
 def can_build(env, platform):
-    return env.editor_build
+    return env.editor_build or env["betsy_export_templates"]
+
+
+def get_opts(platform):
+    from SCons.Variables import BoolVariable
+
+    return [
+        BoolVariable(
+            "betsy_export_templates",
+            "Enable Betsy image compression in export template builds (increases binary size)",
+            False,
+        ),
+    ]
 
 
 def configure(env):