0.5.3
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- events processing fixes
- added wxMozillaBrowser::SetZoom
- added more events: wxMozillaTitleChangedEvent, wxMozillaProgressEvent,
  wxMozillaBeforeLoadEvent, wxMozillaStateChangedEvent,
  wxMozillaSecurityChangedEvent, wxMozillaLoadCompleteEvent and
  wxMozillaStatusChangedEvent
- added wxMOZILLA_CHECK_VERSION macro for checking available wxMozilla version
- added wxMozillaSettings class for setting preferences
