PE64: Replace manual PE checksum calculations with Win32 API call instead.
I was trying to avoid using Win32 API calls in this project for the most part, however, this calculation has multiple conditions that can alter its result. Steamless was only producing proper checksums about 40% of the time as a result of this. Instead, the project will now use the system API call 'MapFileAndCheckSum' to calculate the checksum properly.
API: Add new option RecalculateFileChecksum to allow unpacked files to have their PE checksum recalculated.
API: PE32 - Add new functionality to Pe32Helpers to recalculate a PE file checksum.
Unpackers: (x86) Add support for new RecalculateFileChecksum setting.
64bit handling to be added soon.
API: PE36 Adjusted FindPattern to return a long instead of uint. Default return is now -1.
Unpackers: Updated all usages of FindPattern to reflect new API change.
Unpacker: v31.x64 - Adjust size of data searched when determining the variant version. Fixes #56
Misc: Update project copyrights.
Misc: Remove some unused/dead code from the UI.
Update Paypal links to use newer Paypal.me format.
Fix issue with structure size casting that can cause an exception when trying to read a stub header structure.
Fix typo's on some spelling.
Added new UseExperimentalFeatures option.
Added new dynamic offset reader for v2 stub parser to better support more files. (experimental feature)
General code cleanup.
