Fix inconsistent linkage warnings from Visual Studio caused by mismatched dllexport specifiers.

Both definition and declaration need to have dllexport present, and added RELOOPERDLL_EXPORTS define to the .cpp file so it always sees the dllexport version instead of dllimport.
Bump version to 1.9.5 to cause relooper to rebuild after previous change.
Merge pull request #2057 from juj/relooper_linkage

Fix inconsistent linkage warnings from Visual Studio caused by mismatched dllexport specifiers.