Fix scripts/forum-dwarves.lua to work with 0.40.13
Add scripts/markdown.lua script. Based on forum-dwarves.lua but exports to markdown (obviously for reddit)
Update scripts/markdown.lua to work with 'announcelist' screens (most notably announcements and combat reports)
Some nonfuncitonal updates to scripts/markdown.lua: update help text, move output filename to a variable for easier modification
scripts/markdown.lua: Added support for 'topicmeeting' screens. Added option to provide own filename. Added option to overwrite previous data.
scripts/markdown.lua: Fix description comment so that the script isdisplayed correctly by 'ls'
Merge https://github.com/Mchl/dfhack into develop. Manually remove trailing whitespace, update NEWS.

Conflicts:
	scripts/forum-dwarves.lua