Typedefs starting with `e' in common

• enable common/dlgcode.c:8186
• EncryptionAlgorithm common/crypto.h:140
• EncryptionThreadPoolWorkItem common/encryptionthreadpool.c:90
• EncryptionThreadPoolWorkType common/encryptionthreadpool.h:24
• ExceptionHandlerThreadArgs common/dlgcode.c:1653