v6.0.4 File Uploading and New System Prompt Setting

What's Changed

• Added the ability to set a system prompt globally for all supported models
  • Enter the system prompt in the Settings Dialog
• Added the ability to import files and extract and add their contents to the current conversation.
  • Image files cannot be added currently, only used for vision processing.
• Fixed bug causing the conversations dialog to close while in the mobile layout and attempting to edit a conversation title.

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• Feature/add ability to set system prompt by @Fingerthief in #76
• Feature/upload files to import text into conversation by @Fingerthief in #77

Full Changelog: v6.0.3...v6.0.4