Code template regression & update

[Vigilans]

Now:

• "-c" uses codeonly.tpl and generates comment with metadata and [fid] name
• "-cx" fallbacks to original behavior.

Examples:
"-c":

C:\Programs\nodejs\node.exe --inspect-brk=41626 bin\leetcode show 1 -c
/*
 * @lc app=leetcode id=1 lang=cpp
 *
 * [1] Two Sum
 */
class Solution {
public:
    vector<int> twoSum(vector<int>& nums, int target) {
        
    }
};

"-cx":

C:\Programs\nodejs\node.exe --inspect-brk=30942 bin\leetcode show 1 -cx
/*
 * @lc app=leetcode id=1 lang=cpp
 *
 * [1] Two Sum
 *
 * https://leetcode.com/problems/two-sum/description/
 *
 * algorithms
 * Easy (43.41%)
 * Likes:    10448
 * Dislikes: 345
 * Total Accepted:    1.7M
 * Total Submissions: 3.9M
 * Testcase Example:  '[2,7,11,15]\n9'
 *
 * Given an array of integers, return indices of the two numbers such that they
 * add up to a specific target.
 * 
 * You may assume that each input would have exactly one solution, and you may
 * not use the same element twice.
 * 
 * Example:
 * 
 * 
 * Given nums = [2, 7, 11, 15], target = 9,
 * 
 * Because nums[0] + nums[1] = 2 + 7 = 9,
 * return [0, 1].
 * 
 * 
 * 
 * 
 */
class Solution {
public:
    vector<int> twoSum(vector<int>& nums, int target) {
        
    }
};