Ruby: Relax SWIG version for compatibility check
- Turns out the Ruby-2.7.0-compatibility commit made it into SWIG 4.0.2
Ruby bindings: Fix all kinds of brokenness
- Turns out int64_t function args require stdint.i for auto-conversion.
- The imported module name is (still) 'Openshot' — lowercase 's'.
- #TIL that accidentally dropping the OUTPUT_NAME config leads to
a non-loadable shared library, due to the filename being wrong.
- src/bindings/ moves to /bindings/
- src/examples/ moves to /examples/
- Contents of include/ merged into src/ with same hierarchy
- src/Qt/demo/ moves to examples/qt-demo/
