Prep for Gregg Isaacson/first site launch

[pjrundle]

• reorder view switcher (mob/tablet etc) options
• minor visual tweaks to CAppInFlowNotification
• match "withProp" convention in CAppModal
• typo: correct misspelling of "characters"
• add number of columns change functionality to BCards - editor ui and template
• increase charLimit for RTE's + re-enable return/new line for RTE's in existing blocks
• add bg cover, bg position controls to assets
• add initial testimonials block
• add color changing functionality to RTE's
• remove ill advised ux treatment - btn editor, edit theme pane
• add initial CWebTxt, CTextModule changes to accommodate, font sizes in REMs
• initial oembed functionality - add to asset blocks
• add UFloatingDebuggerPanel
• add block heading based editor block titles + truncate