Too Generic Image Input Name

**Describe the bug**
When using `upload-image`, an input with name="image" is created. This is a very generic name, which can conflict when using EasyMDE in a form.
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It changed the type from a file upload to a list of file uploads, and the inlined image was also not cleared, so my server received two files instead of one for my other 'image' field.
Using a less generic name like 'easymde-image' would solve this issue.

**To Reproduce**
Steps to reproduce the behavior:
1. Create a form with a textarea and an image upload input called "image"
2. Enable easymde on the textarea
3. Enable "image-upload" in the easymde toolbar
4. Upload a file via easymde and in the normal input
5. Submit the form

**Expected behavior**
I expect easymde to not impact the normal behavior of my form by using a namespaced input or clearing/removing the new input after usage.

**Screenshots**

**Version information**
- OS: Ubuntu
- Browser: Vivaldi (Chromium based) but it happens on all browsers
- EasyMDE version: 2.18.0

**Additional context**
This may be more of a feature request than a bug, but it broke my project so I'm reporting it as a bug :)