Pushing this first working version, further tests will be done later

Getting rid of tabs

Removed the :search_command state to reduce redundancy and playing instead with the states stack

Fixed some issues, now covering some commands which were missing and now better highlighting some special operators, args and functions

Fixed a minor syntax error in the example, for good measure

One of the regex for multiline comments did not have the multiline option and was raising an error on \n

Added missing EOF newline to comply to the linelint rule