* calculating percentiles is now truly async
* open docs

* install debug

* idx_t -> Idx_t and replacing all uint32_t/long_t I could find

* as well as gui_focus_group, manual_identities and other variables related to identities

* average_samples is uint32_t

* fixing a couple more warnings

* some more warnings removed
* preventing frame < 0

* fixing some warnings

* updating docs

* opening/closing video in separate thread

* coloration changes
* deselect on broken file
* removing some debug messages
* display average progress

* adding checkboxes to opening dialog
* renaming callbacks
* callback also on empty path
* hiding file selection when switching tabs
* video info for MP4s
* smaller fonts

* fixing issue #4
* adding Dropdown and Textfields to Opening page

* using averaging_method_t