HTML Widgets and Portals; Theming CSS can now be in LESS format

The CSS used to customised HTML Widgets can now be LESS-formatted CSS.

This is is used in the following places:

• finPOWER Connect Cloud Configuration, Theme, HTML Widgets page
• Portals form, HTML Widgets page

This has many advantaged in cluding the ability to nest styles, e.g.:

.myStyle {
  border:2px solid red;

  > .mySubStyle {
    border:4px solid green;
  }
}