feature_request(symbols): replace # symbol in header

[Kristinita]

1. Summary

It would be nice, if user can replace # symbol in issue header to another symbol.

2. Expected behavior

Example: # → %.

Ctrl+Shift+P (⌘⇧p for Mac) → GitHub Issue: Create Issue → I print user/repository → Enter.

% Title         :
%% Label        :
%% Assignee     :
*=================================**CONTENT**=================================*
*<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<ISSUE START>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>*
### Sasha first header

### Sasha second header

3. Argumentation

I use Markdown Numbered Headers package for automatically add numbers to headers.

I place caret to beginning of the file → Ctrl+Shift+P (⌘⇧p for Mac) → Markdown Numbered Headers: Insert/Update Headers Nums → I get result:

# 1. Title         :
## 1.1. Label        :
## 1.2. Assignee     :
*=================================**CONTENT**=================================*
*<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<ISSUE START>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>*
### 1.2.1. Sasha first header

### 1.2.2. Sasha second header

Numbers are added to the header.

Expected:

% Title         :
%% Label        :
%% Assignee     :
*=================================**CONTENT**=================================*
*<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<ISSUE START>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>*
### 1. Sasha first header

### 2. Sasha second header

Thanks.

[divinites]

this should be easy, I will look into this problem, Thanks for your support!