Allow to select several groups in groups window + sorting groups.

[77ZaRR77]

Would be very handy to select several groups in Groups window. Also sorting them with alphabet order from first letter. For example first starts h_ groups, then u_ and l_ . I need such stuff for making skeleton anim.

[zturtleman]

It could be converted to a list box with buttons to move group up and down in list. Like the animation sets window.

This applies to materials and bones as well. Though currently bones must be after parent bone, which is required by (most) exported skeletal formats as well.

[m-7761]

To be consistent a better way would be to make an "Advanced" groups editing window, that is a separate or nested window.