WebUI 4.X features ideas

[luc-github]

Starting the new features ideas of ESP3D-WebUI 4.0
The communication with ESP3D should not change with ESP3D 4.0, so let's focus on WebUI capabilities

1 - Decrease the foot print

• Remove all panels but Settings Features and ESP3D icons

• Move all panels as extensions
  This should let user to choose only what he want decreasing the footprint and limit the release package to 1 core generic, all others panel / pages / setting will a set of extension

• Create an extension to download necessary extensions accordings needs, target FW, features
  Or

• Create a page in configurator that will build a package with all defined feature

2 - Improve extension API to not use iframe but become a real module

• Rewrite the extension API to become a hot load module that will be part of the main code instead of iframe
• Propose a tool for migration, as API change should be limited to code organisation and code loading

3 - Limit iframe to external pages

Any suggestion/contribution is welcome as usual