Added shortcut for align environment.
wizardfuncs: Add EAL
imaps.vim: Add multibyte LHS support

- Add s:MultiByteStrlen() and s:MultiByteStrpart()
- Allow for example IMAP chaining as follows:
call IMAP("\\subset", "⊂", "")
call IMAP("⊂eq", "⊆", "")

References:
https://sourceforge.net/p/vim-latex/patches/5/