M1b Upgrade codebase

[timea-solid]

I would like to modernize the code base: optimize, better bundles, configs...

[timea-solid]

See:

• solid-logic: Improved library solid-logic#100
• pane-registry: Improved structure pane-registry#53
• solid-ui: Improvements solid-ui#597
• source-pane: Structure improvements source-pane#91
• activitystreams-pane: Structural improvements activitystreams-pane#64
• chat-pane: Structural improvements chat-pane#142
• contacts-pane: Improved structure contacts-pane#138
• folder-pane: Improvements folder-pane#94
• issue-pane: Improvements issue-pane#102
• meeting-pane: Improvements meeting-pane#94
• profile-pane: Improvements profile-pane#90
• solid-panes: Improvements solid-panes#421
• mashlib: Improvements mashlib#220