emoji.lua: Add rofl=😂 and other improvements

[Nomarian]

Script info

• Script name:  emoji.lua
• Version:  6

• Requirements:  lua

• Min WeeChat version: 

• Script tags:  input

Description

Add rofl=😂, shut up linter/luacheck
Linter: functions explicitly go to _G or are local
Moved emoji table to the end and its divided by line (diffs were too big)
str2emoji(): simplify pattern
str2emoji(): gsub points to table instead of function (faster)
use string.find in conditionals not string.match
Use function alias for functions that all do the same thing
tabs search entire string :token: and look/replace with approximations

Checklist (script update)

• Author has been contacted
• Single commit, single file added
• Commit message format: script_name.py X.Y: …
• Script version and Changelog have been updated
• For Python script: works with Python 3 (Python 2 support is optional)
• Score 100 / 100 displayed by weechat-script-lint