Merge pull request #2052 from juj/test_float_literals

Add test for storing special float literals in source code.
Merge pull request #2035 from juj/html5_events

HTML5 Events API.
spinner during startup; #2050
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.