Symfony 5 support

• Added Symfony 5 support #377
• Removed component installer dependency
• assetsPath option removed
• Return hash #368
• Controller deprecation fix #361
• Some more minor fixes

Summernote PDF insert, Twig deprecation fix

• Update twig extension to use supported Twig classes instead of legacy ones #374
• Summernote PDF fix #372

Add an opportunity for injecting S3 options like ACL permissions

Add an opportunity for injecting S3 options like ACL permissions from #365

Fixed plugin(s) node configuration and added homefolder feature

Added feature #359 by @danut007ro
Fixed issue #353

Fixed post execution event

Fixed post execution event #349
Fixed tree builder deprecation #350

Fixed decode function, now returns result of getPath()

Fixed decode function, now returns result of getPath()
Fixes #341

Fixed window resize, and throw notfoundexception with inexistent instance.

Fixed window resize, and throw notfoundexception with inexistent instance.

Separated sftp and ftp settings for flysystem drivers.

Separated sftp and ftp settings for flysystem drivers.

Changed directory structure, added options for dropbox2, box and onedrive

Changed directory structure, added options for dropbox2, box and onedrive.

Now bundle code resides in src/ directory, documents in docs/ and tests in tests/ tests accordingly.

Changed name for dropbox driver in configuration from dropbox2 to dropbox (this behavior changed from master branch only).

Fixes #306, fixes rendering widgets for tinymce and summernote

Fixes #306