0.8.4

Features:

Signature help popup has syntax highlighting on signature, and emphasizes active parameter (with help from @predragnikolic)
Documentation and default configs have been updated.

Fixes:

• Fix for workspace edits failing to apply
• Fix double '$' or removal of leading characters in some completions (clangd/PHP/Powershell)
• Fix completions occasionally failing while checking view syntax (@rwols)
• Increased protocol compatibility in stdio header parsing (@bscottm)

Deprecations:

highlight_active_signature_parameter setting removed, this is now default behaviour.