Merge pull request xtermjs#2299 from Tyriar/release/3.14-5

Pull bug fixes into release/3.14 and bump version

Merge pull request xtermjs#2266 from Tyriar/release/3.14_2263

Release/3.14 2263

Merge pull request xtermjs#2179 from Tyriar/release/3.14_2174

Fix NPE in open

v3.14.1

Merge pull request xtermjs#2145 from xtermjs/Tyriar-patch-1

v3.14.0

v3.13.2

v3.13.1

Merge pull request xtermjs#2055 from xtermjs/Tyriar-patch-2

v3.13.0

v3.12.2

Merge pull request xtermjs#2011 from xtermjs/Tyriar-patch-1

v3.12.1