Fixes #1723

[ehhc]

Attached to this issue is a very quick-and-dirty solution for the given problem. Alas I still do have a lot of questions, I can’t figure out (resp. a lot of issues I stumbled over):

1. The html export of notes containing images is broken -> no images present
2. Markdown export with embed files/images is broken -> links are broke
3. Why are the dropped files named with Math.random().toString(36).slice(-16) (CopyImages.js) instead of something more resilient like Hash(Timestamp + filename) ? Math.random() might return the same result again. Especially when not properly initialized!
4. Why are there (at various places) different definitions of markdown-templates to include images? I’ve found at least 3 without being able to figure out why they aren’t at one central place and in what cases they are used
5. Why are there multiple definitions of the image folder path? e.g. moveNote.js:77, exportNote.js:9, copyImage.js:22 and none global definition? A global reliable definition of this constant variable is missing
6. No documentation (e.g. JavaScript Doc) is provided. You have to guess what a method does and why it is necessary

Further issues coming up with my dirty fix hack:

• methods aren’t doing what they promise to do: e.g. copyImage is able to and use for copying abbreviated files.
• “Images” folder (see 5) ) contains further non images attachments as well

I hope you can understand my surprise/irritation about these various issues..