[tools] 支持通过--project-name=xxx设置生成的工程文件名称

默认为project.xx 与原来保持一致
相关：https://club.rt-thread.org/ask/article/f998b21633f90916.html

tools/options.py

@@ -51,7 +51,7 @@ def AddOptions():
     AddOption('--project-name',
                       dest = 'project-name',
                       type = 'string',
-                      default = None,
+                      default = "project",
                       help = 'set project name')
     AddOption('--reset-project-config',
                       dest = 'reset-project-config',