Interpolation Beta

v1.6.0

preparing for v 1.6.0

Refactoring, tests, some new features

• fixed #4 Add a shortcut to focus on the time slider
• fixed #64 Export Video error: no attribute 'animationFrameCounter'
• fixed #26 mktime out of range
• fixed #81 error message for export video errors on Mac
• fixed #28 argument 1 has unexpected type 'float'
• fixed #85 locale support
• fixed #83 support for YYYY-MM-DDTHH:MM:SS timestamp format
• fixed #79 support delimited text files