Appearance: use environment object var as display name

[wyrnat]

untested as the current master version is not working for me

what

• display human readable names for the Environment combobox

why

• user is able to set the displayed name without restriction from filesystem naming
• what was the use of the object variable "name" in Environment anyway? Please correct me if I am wrong, but I could not find the purpose

how

• load all environments from the env_list and gather "name" from each. gather all names into a list
• set modified list to GUI object for display
• catch a missing object variable or a faulty environment. object variable should not be mandatory and faulty environment will be handled when user loads it for usage

closes #14

[wenatuhs]

@wyrnat Thanks so much for the contribution! It has been years since this PR (sorry for the inactivity in this repo! Recent activities have been happening in the new location) so I feel maybe we have to do some work on the code to adapt it to the new code base. I'll leave the PR as is and archive this old repo (to not cause further confusion). Talk to you in the new repo soon!