Update to provide basic ability to write scss styles utilizing variables produced via the interface (colors, fonts, etc.)

Issue #2640614: Warning: in_array() expects parameter 2 to be array, null given in omega_preprocess_page()

Creating embedded Omega Tools module and moving  hook_system_themes_page_alter() to the new module. Requires enabling module manually until #474684 is resolved.

Fixing odd '_core' data stored in config object when returning layout options for theme settings form.

Wide update allowing two major updates; Enable/Disable All/Any libraries provided by any parent/base theme. Also allows inheritance of layout settings to sub themes allowing a single base/parent theme to control the layout of multiple sub themes.

adding force export option to primary omega theme to disallow editing, and require creating a subtheme.

Adding omega_simple_starterkit to the starterkits folder. Contains minimal regions/region groups, only a single layout type, and the 4 default breakpoints.

Adding some helpful inline documentation, pushing some commented out changes that attempt changing layouts on view pages.

Adding ability to assign custom layouts on taxonomy vocab pages. Also making variable name for node layouts more precise by leading with node_type_TYPE_layout

Cleaning up empty variables pushed to $theme.layout.$layout_id config variables, cleanup on a few comments and cleanup for some theme settings elements

Adding an informational message to signify that a breakpoint group has been changed for a layout, and that saving the form is required before then configuring the new layout/breakpoint combination

Updating _omega_getAvailableBreakpoints to return an array that will use <optgroup> to separate out the breakpoints by theme in a cleaner way that appending/prepending text to the <option>

Refactoring usage/storage of region_groups, breakpoint_groups and layouts to allow switching breakpoint groups for each layout.