Hardcode menu Plugins in UI, move it before menu Help
Merge pull request #16 from varlog00/varlog_meddle

Hardcode menu Plugins in UI, move it before menu Help
Remove Lua plugin support.
Keep a list of engines supported and check a plugin's declared engine against the list when determining if it's a valid plugin.
Merge https://github.com/user-none/Sigil
updating to latest