Adding actions to the EnvironmentVariables wizard to perform add,edit & remove

Fixing tooltip for add

Removing Context menu actions

Removing toolbar actions

Adding buttons for editing Environment variables

Moved buttons to the side, scrollbar now showing

Removed scrollbar, unused imports

Reduce spacing between controls

change the labels from New to New... and Edit to Edit... (and leave Remove as is) to follow the Eclipse UI convention.

Updated environment part to raise notifications when environment variables change
Merge branch 'gh-60123062' of https://github.com/Phanatic/eclipse-integration-cloudfoundry into gh-60123062