fix: update BMap bindings

- send message in console if PyBMap fail to load native dynamic library. this is good for user experience.
- remove snippet from BMap bindings generator. We now insert generated code manually.
- fix C sharp code generation issue in BMap bidnings generator.
- add some content for BMapSharp.

CodeGen/BMapBindings/PythonWriter.java

@@ -69,15 +69,7 @@ public class PythonWriter {
 		OutputStreamWriter writer = CommonHelper.openWriter("dest/BMExports.py");
 		IndentHelper helper = new IndentHelper(writer);
 
-		// write snippet
-		CommonHelper.writeSnippet(writer, "snippets/header.py");
-
 		// write function decls
-
-		helper.puts("");
-		helper.puts("#region Function Defines");
-		helper.puts("");
-
 		for (ExpFctDecl fctdecl : data) {
 			// write annotation
 			// function name
@@ -97,10 +89,6 @@ public class PythonWriter {
 					.stream().map(value -> pythonTypeGetter(value)).collect(Collectors.joining(", ")));
 		}
 
-		helper.puts("");
-		helper.puts("#endregion");
-		helper.puts("");
-
 		writer.close();
 	}