[BUGFIX] Proper treatment of external and standalone assets
[FEATURE] Implement parsing of additional parameters
[TASK] Respect viewhelper argument additionalParams
Merge pull request #300 from bjo3rnf/linkparams

[FEATURE] Implement parsing of additional parameters
Merge pull request #299 from bjo3rnf/assetfix

[BUGFIX] Proper treatment of external and standalone assets