v3.8.0

LoweredCodeUtils v3.8.0

Diff since v3.7.2

Merged pull requests:

• Rebase #146 (#160) (@Keno)
• codeedges: Include lowered default constructors (#162) (@Keno)
• Support typegroup-based struct lowering (#163) (@Keno)
• Remove no longer used domtree.jl (#164) (@aviatesk)
• codeedges: Track EnterNode scope dependencies (#165) (@aviatesk)