Merge pull request #2 from TakSuyu/master

Did some grunt work for the Edit Mods Dialog
Small tweaks to the assets - delete extra files
Legacy versions downloaded from the new location are treated as legacy versions!
Piddle-farting with 1.6 instances. Now with more json!
Replace one line. Get downloading of 1.6 jars working. Yay.
More work on the downloader and 1.6 instance creation
Added Per-Instance settings
Broke instance loading(?), also attempted to make Toolbar grayed out when no instance is selected. For debug purposes it is initially not grayed out
Finalize the instance settings dialog, add setting reset mechanism
Parsing the version files, part I
Parsing the version files, part II
Parsing the version files, part III
Merge remote-tracking branch 'upstream/master'

Conflicts:
	gui/mainwindow.cpp