Changed order of Script save. This avoids a race condition where Scripts that die very quickly tries to delete themselves before having had time to save first. Resolves #597.
Escape <, > and & when MXP is enabled.
Fixed arg_regex inheritance across child commands. Resolves #601.
Updates to menu_node to make sure separate, new cmdsets are initialized in different tree instances, as per #596.
Merge branch 'mxpescape' of https://github.com/titeuf87/evennia into titeuf87-mxpescape