Fixed a bug with timing of injecting regex replacements
moved T (extruder) tracking to queued command stream
check that we have loaded filament on extruder 1
issue: MatterHackers/MCCentral#5029
Don't do actual switch of extruders until there is a pending move command
moved ui out of Pause Handling Stream
added unload option to filament run out screen
added load filament option to unload screen
added resume option to load screen (if printer paused)
issue: MatterHackers/MCCentral#3815
Feature request: Unload filament when filament runs out
issue: MatterHackers/MCCentral#4870
Layout regression in ShowMessageBox
issue: MatterHackers/MCCentral#4864
Last page of unload filament should offer to Load Filament