Rename ui variables

[davidferlay]

Observed

• Customizables variables are named as such:
  • plasmactl_web_ui_platform_page_name
  • plasmactl_web_ui_platform_name
  • plasmactl_web_ui_platform_header_name
  • plasmactl_web_ui_platform_favicon

Expected

• It would be great to rename them for more clarity
  • plasmactl_web_ui_platform_page_name > tab_title
  • plasmactl_web_ui_platform_name > root_name
  • plasmactl_web_ui_platform_header_name > header_title
  • plasmactl_web_ui_platform_favicon > favicon

Note

• It would require to update local projects config file