Revert "Arch: Turned jreinhardt's fix to webGL into an option"

This reverts commit 90f2fc203466dbbb81ad26849eb3dd4b7b53f326.

Conflicts:
	src/Mod/Arch/Arch_rc.py
	src/Mod/Arch/Resources/ui/archprefs-import.ui
Use new curve discretization
bugfix: use subelements in Sweep