Merge pull request #370 from hediet/pending-releases/v1.6.6-alpha.6

Release 1.6.6-alpha.6 as 1.6.6

Fixes #354

Alpha 5.

Merge pull request #304 from micellius/master

Add support for zoomFactor and globalVars Draw.io configuration options

Merge pull request #303 from TheOneKevin/master

Add code link support for hierarchical document symbols

Merge pull request #286 from hediet/pending-releases/v1.6.4-alpha.1

Release 1.6.4-alpha.1 as 1.6.4

Updates draw.io to 16.0.0

Merge pull request #282 from hediet/pending-releases/v1.6.3-alpha.1

Release 1.6.3-alpha.1 as 1.6.3

Updates changelog.

Updates changelog.