Create IntelliJ/PhpStorm plugin

[danon]

Add:

• refactorings
• inspections
• quick fixes

Example actions and inspections could include:

• change $pattern->match($s)->test() to $pattern->test($s)
• change $pattern->match($s)->first()->text() to $pattern->search($s)->first()
• change Pattern::inject('@', [$value]); to Pattern::literal($value)