Create simple ramp layout

[eomine]

The "Simple Ramp" layout basically removes all sidebar panels except "Font" and "TypeSpec Properties". The "Editor" panel is still there for now, but it will probably be removed. The idea is to make the bold/italic menu a floating menu that shows up near the selected text.

Two new features implemented in the "Simple Ramp":

• Automatically set the "TypeSpec Properties" panel to the properties of the focused block of text;
• Simplified style menu, with only 2 toggle buttons for bold and italic. The "bold italic" style should be applied when the user toggles both buttons on.

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Note: the bold/italic menu is not working properly yet. In fact, the style buttons in the existing "Ramp" layout don't work as expected. For example:

• Select a word and click "bold": the word becomes bold;
• Then click "italic":
  • Expected result: the word should become italic instead of bold;
  • Actual result: the bold style is removed, but the italic style is not added.

[eomine]

@graphicore Updated the PR with the changes to the typespec detection moved to _prosemirrorDispatchTransaction as we discussed yesterday.