Initial version of template script
Support centralized output message feature
[Bugfix] Fix MSG_CAUTION type output bug
[Bugfix] BasicCmdChk() does not really work for all command list.
1. Add BasicVarChk() for variable checking feature support
2. Modify the condition of input check in BasicCmdChk()
Using 'less' command instead of 'clear' command for usage help
Add sub-function for central message output.
Add msgn() for message output without new line