SwiftLint2

Rewrite `ForceUnwrappingRule`

Add capture previous of "!" for:
- checking whether SyntaxKinds is comment, string, keyword or type identifier
- checking whether character is ")"
- checking whether SyntaxKinds is identifier or not
- SwiftDeclarationKind is one of some "Var*" and declaration containing "="

Add capture next of "!" for:
- checking SyntaxKinds is identifier

By applying this, the duration of linting Carthage 0.14 increase from 300ms to 380ms.