Jazzmin theme - Compatibility implementation

[doolijb]

I'm tracking this issue while I work on implementations.

Redundant inline titles

[doolijb]

No inline collapse support

[doolijb]

Sidebar styling

Sidebar doesn't hideaway on toggle

[doolijb]

Regions tab style

[doolijb]

PR made for Redundant inline titles/fieldsets, tab style, sidebar collapse/hideaway.

Fieldsets could use more attention in the future.