feat: add multiple file support

[magicmatatjahu]

Description

TODO:

• parse siblings documents (referenced), when given document is updated.
• add popovers for removing directories/files.
• refactor silly code
• render all diagnostics in one view - make option to render given diagnostics when user will change current file/document or render all diagnostics (similar to VSC problems)
• improve file tree view like in VSC - creating file/directories, inline inputs etc
• add more options to the context menus on file tree
• improve editor dropdown
• handle url/base64 files - create for them the in-memory files
• optimize rendering of visualiser and html-template
• refresh directories from file-system

Related issue(s)
Resolves #528
Resolves #167
Resolves #195

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[sonarqubecloud]

SonarCloud Quality Gate failed.   

2 Bugs
0 Vulnerabilities
0 Security Hotspots
75 Code Smells

No Coverage information
11.7% Duplication

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