* Fixed a few typos in the code
* Switched the meaning of the Ctrl and Alt modifiers when selecting keyframes.
- Ctrl is now select all keyframes on one side of time cursor
- Alt is now select all keyframes at same time as a particular keyframe.
TODO:
While testing these changes, I've found that this column-select is not working yet as the tolerances are too low. This will be rectified soon.
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