[feat] change BMERevenge model read method

- divided json into small pieces for easy management.
- change json reading method for change (1)

.gitattributes

@@ -1,2 +1,6 @@
 # our generated mesh should be save as binary
-*.bin binary
+*.bin binary
+# json is data and not good for human reading(althought I edit it on my own hand.)
+# so set it as binary
+ballance_blender_plugin/json/basic_blocks/*.json    binary
+ballance_blender_plugin/json/derived_blocks/*.json  binary