Too many ..._name variables?

[ronpandolfi]

Currently, there are:

"core_name": "xicam",
"project_name": "test",
"app_name": "",
"plugin_name": "test",

I propose to change this to:

"package_name": "xicam.myproject",  # includes core_name implicitly, but does not require it
"display_name": "My Project",  # human readable project name

Multiple plugins are not supported in a this cookiecutter, so plugin_name should always mirror package_name, at least as a template.

[HarinarayanKrishnan]

I tried to simplify the names, for now I just made the package name equivalent to "myproject".