Perform a soft reload of some project state when editing theme files

[thecrypticace]

Before this editing the same CSS file as the theme could cause the "project" to re-initialize. There's still cases where that's necessary but for a v4 project should be much less. This means that you'll no longer:

• See a major flicker when editing @apply blocks inside the same file
• Have completions go completely missing in the face of some CSS syntax errors while editing

This isn't the best approach to this but it should be sufficient for now.

Note: This does not currently track new @imports for reload-ability and you'll need to reload VSCode to pick those up for now.