Ported ReplacePostFixExpressionWithAssignmentAction.
Ported ReplaceAssignmentWithPostfixExpressionAction.
Cleanup.
Ported ReplaceWithOperatorAssignmentAction.
Ported SplitIfAction.
Fixed coding style.
Merge pull request #417 from TheCommieDuck/replace-postfix

Ported 'ReplacePostfixExpressionWithAssignmentAction', 'ReplaceAssignmenWithPostfixExpressionAction', 'SplitIfAction', and 'ReplaceWithOperatorAssignmentAction'.