v3.0.0

• added feature to split in n commits. useful for split-in-as when you basically just want to squash the latest commit from some remote
• removed libgit2 in favor of just using git in the cli. It is much faster and less complex
• changed the format of repo files, now repo files have toml formatting. This massively simplifies parsing
• fix bug with topbase 0 merge. If topbase detects nothing to topbase it will just abort. no need to rebase anything.
• added feature to generate a repo file for split-in-as. If you pass the flag --gen-repo-file it will create a repo file in your current working directory that contains the mapping you made with the --as option.
• cleans up mgt check output and adds a suggested command