Add Feature: Lora/Embed Syntax Highlighting

[ElliottLester]

We now highlight lora and embedding in prompts if they will be accepted by the server. Green -> Matches exactly one lora/embedding in the server list Yellow -> Matches more than one lora/embedding on the server and probably won't work Red -> Doesn't match any lora/embedding on the server

Notes:

• Move the lora and embed regular expression to utils
• Create QPromptHighLighter and add it to SDImgPageBase
• Fetch list of embeddings from server
• REFRESH_INTERVAL is now 15 seconds
• Check result in transparency_mask_inserter()

[JasonS09]

It works now, thanks!