Enhance Keyboard Control

[raphael-goetz]

The current interfaces are heavy mouse dependent. Please improve keyboard control.

Some examples are:
Pressing enter in forms will not submit them.
Tabbing inside inputs of forms or nodes are not tabbing at all or skipping buttons etc

[nicosammito]

@raphael-goetz Tabbing inside inputs is now working? That can be true, because this is not disabled and a browser native feature. Please provide your browser version.