C++ namespace cleanup (except tests).

libsolidity/analysis/StaticAnalyzer.h

@@ -28,14 +28,12 @@
 #include <libsolidity/ast/ASTForward.h>
 #include <libsolidity/ast/ASTVisitor.h>
 
-namespace langutil
+namespace solidity::langutil
 {
 class ErrorReporter;
 }
 
-namespace dev
-{
-namespace solidity
+namespace solidity::frontend
 {
 
 class ConstructorUsesAssembly;
@@ -102,4 +100,3 @@ private:
 };
 
 }
-}