Incorrect markdown import -- lists

[eagerm]

CherryTree 0.99.36 -- built from git repo

Import of lists and hyphens in Markdown is incorrect.

To reproduce:
See the attached test1.md file, import into CherryTree as single Markdown file.

Expected formatting is in test1-pandoc.txt (actually HTML) (generated by "pandoc test1.md -o test1-pandoc.html").
Actual (exported) output is test1.txt (actually HTML).

According to Markdown cheatsheet plus sign (+) or asterisk (*) can be used as list marker.

Errors:

1. Line 3 (text with leading -) ignored
2. Line 9 (text with trailing -) hyphen lost
3. Lines 14-15 (nested indent) nesting lost
4. Line 17 (hyphen embedded in text) remainder of line lost
5. Line 26 (text surrounded by *) emphasis (italics) lost
6. (Removed)
7. Lines 35-36, see 3 above.
8. (Removed)
9. Lines 43-59 (use + for lists) plus sign ignored

test1.md
test1-pandoc.txt
test1.txt

[eagerm]

Partial fix for list import issues:

Fix items 1, 2, and 4.
commit-92a4a1f.txt

Will clone and submit a pull request.