filezilla: update to winscp 5.5.2
core: update to winscp 5.5.2
update WinSCP version info
Merge branch 'winscp552'

* winscp552:
  update WinSCP version info
  core: update to winscp 5.5.2
  filezilla: update to winscp 5.5.2
version info: update
refactoring: mark const parameters as const; rename parameters; remove unused function
refactoring: mark OUT parameter; rearrange parameters
refactoring: mark const parameters as const; rename parameters
refactoring: mark OUT parameters
refactoring: mark const parameters as const
refactoring: mark local function as static
refactoring: mark const parameters as const; rename parameters
code style
define TRANSFER_BUF_SIZE 128 * 1024
TFileOperationProgressType::LocalBlockSize: minor fix
refactoring: FileOperationProgress.cpp
refactoring: code style
refactoring: remove if defined(__BORLANDC__)
refactoring: remove ifdef _MSC_VER
refactoring: remove pragma package(smart_init)