Hard line breaks

[vkbo]

Markdown supports hard line breaks, but novelWriter doesn't currently parse these. Currently, line breaks are not added at all when rendering (aside from making the export source readable). Instead, as markdown specifies, paragraphs are separated by one or more empty line.

In markdown, hard line breaks are achieved by adding two or more spaces at the end of a line. An idea would be to add this as well, but highlight them with the syntax highlighter so it is visible. A keyboard shortcut would also be useful, one that would add two spaces and a return, possibly with the Shift+Enter and Shift+Return key combination.

[vkbo]

Added in PR #83. Uses Ctrl+Enter instead.