Happy Nu year!

• We wrote up a year-in-review post
• notryanb added a new uniq command (#1132)
• quebin31 updated some of our internal structures names to be more consistent (#1133)
• andrasio refactored some plugin code and continued to improve tests (#1135)
• miller-time fixed how Nu handled single-quotes in external commands (#1139)
• vorot93 and jonathandturner finished the move to using clippy, which is now enabled on CI (#1136, #1142)
• Aloso added support for moving a word-at-a-time with ctrl-left and ctrl-right (#1141)
• avendesa replaced the which command with an upgraded version (#1144)
• jonathandturner has been improving stability and removing unwraps, going from 204 to 86 (#1147, #1148, #1149, #1150, #1152)