Slider: Moved events to named functions (to allow extended plugins to hook in).
Build: Fix generate_themes task to adopt to changes in download builder.
Updating the master version to 1.10.1pre.
Revert "Updating the master version to 1.10.1pre."

This reverts commit 20cf7abef11e8d2bdbbbdbdb3c320f7f8aa871fd.
Spinner: Inherit font color since we inherit background color. Fixes #8950 - Spinner: value can't be seen in dark themes.