standards and enforcement

[sherakama]

Some cleanup and a couple of changes.

• Rename decanter-base.scss to _decanter-base.scss
• When you remove the global defaults from the color mixin it turns in to just a pass through function. Can we remove it or change it to be useful again.
• Removed neat-omega from the decanter-mixins roll up as it is not a part of this project. neat-omega should be imported where it is used only.
• Added flex-container mixin to roll up
• Removed all global variables from mixins and functions.

[kgcreative]

I'm not opposed to renaming _retrieve-color to color and removing the pass-through function. The color function does need to call a default map, so it is dependent on it existing, but maybe the default map can be configured to accept a setting

[kgcreative]

omega is a custom neat module.

[kgcreative]

This is ready to integrate if you you're good with it