Improving styles

[YakovL]

This branch contains:

• codestyle improvements in Backstage.js, Lingo.js, Wizard.js,
• improvements of styling (markup and CSS) of messageArea, backstage, wizard
  • refactor using BEM (naming convention: blockName, blockName__elementName, blockName_modifierName, blockName_modifierName-modifierValue, the latter not used yet)
  • during refactoring, removed a hack for IE 5, 6 and display: block; for a div
  • backstage and wizard: remove multiple borders/colorful paddings and make padding of wizard symmetric; increase paddings of buttons and status messages in footer
  • messageArea: substitute "close" text with SVG icon but allow to fallback (controlled by chkDontUseSvgIcons option); align the button to the right (without awkward horizontal padding)
• shortened mainSaved message from "Main TiddlyWiki file saved" to "TiddlyWiki saved"

some screenshots: was: became:

was: became: with config.options.chkDontUseSvgIcons = true:

[YakovL]

Ok, to avoid complications chkDontUseSvgIcons option was removed and now the fallback is used only when browser doesn't support inline SVG (old FireFox did)