fbt: building core with respect for debug flag (#1347)

* fbt: building `core` with respect for debug flag
* fbt: added size output for firmware elf
* Infrared: fix cli

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

site_scons/site_tools/size.py

@@ -0,0 +1,24 @@
+from SCons.Builder import Builder
+from SCons.Action import Action
+
+
+def generate(env):
+    env.SetDefault(
+        SIZE="size",
+        SIZEFLAGS=[],
+        SIZECOM="$SIZE $SIZEFLAGS $TARGETS",
+    )
+    env.Append(
+        BUILDERS={
+            "ELFSize": Builder(
+                action=Action(
+                    "${SIZECOM}",
+                    "${SIZECOMSTR}",
+                ),
+            ),
+        }
+    )
+
+
+def exists(env):
+    return True