Marcus Bains "ahead/behind"

Draft PR: #8094

• Markup and CSS for A/B line.
• New theme constants for ahead and behind colors.
• Mods to c-timesystem-axis element to hide domain line.
• New Vue properties.
• Clipping wrapper for MB and AB lines.
• Applied white-space: nowrap to elements that needed it.
• TODO: figure out why contentHeight isn't working right in this branch.

Expanded Time List enhancements

Draft PR: #8095

• Significant markup and CSS changes.
• Revised and greatly simplified execution status and time context labels.
• Activities now use Plan colors.
• Greatly improved layout and wrapping for narrow spaces.
• Added new global data uri's for status icons.
• Added new global 6 step gear-spinner animation for in-progress Activity status icon.
• Added new global absCenter mixin.
• Revised, refined past/current/future styling and theme colors.
• Status icon coloring added to theme constants.
• Updated other themes constants for new approach to bg/fg/em.
• Smoke tested in Espresso and Snow themes.