Revert "Rename license.txt -> LICENSE.txt"

This reverts commit e477da35797ae5dbece52c951a96442823a55057.
Introduce Persist button in the Console panel
Merge branch 'master' of github.com:firebug/firebug.next
Improve API for side panel toggle button
Toggle side panels for the Console panel
Properly update the side splitter theme
Experimenting with simple command editor
Fixed toggling of Resume button icon and centered toggling breakpoints
icon
Hide the original Debugger options and side bar toggle buttons
#91 Disabling Firebug should remove its panels from open toolboxes (workaround)
Toggle button for the Inspector panel sidebar
Toggle side button for custom panels
Fix height of the Style Editor toolbar (workaround fix me)
Move toggle side button logic into a module
Do not show toggle side panel button if there are no side panels + localization
Toggle sidebar button for the Network panel
Fix hasSidePanels API
Properly remove a button
#94 Inspector is broken (only shows html and body)
More experimenting with command editor (working prototype)