feat: Preset text type

[thedist]

This, along with a PR to Companion Module Base (bitfocus/companion-module-base#80), will allow for the use of a text type preset as described in #2843, and while not a full rework of the preset structure as suggested in that feature request the implementation of a text type does allow for modules to start utilizing it while consideration/changes to the preset structure take place at a later date.

The following is an example of some examples quickly placed in a module to show how they would be rendered when using something along the lines of

{
  category: 'Mix 1',
  name: 'Test Header',
  type: 'text',
  text: 'Testing a text preset'
},

The name property takes the place of the header, while the text property will be in the paragraph below the header.