Popochiu v1.8.5 - Mejorandiu

This is just a test release of the latest version of the plugin (which was already released in the main repo).

Fixes

Loading saved games is working when the file doesn't has data for the main types: characters, inventory items or dialogs.
Creating dialogue lines (for E.run([])) with wrong character names doesn't break the game.
Creating dialogue lines with empty emotions doesn't break the game.
DialogText's ContinueIcon now is set to modulate.a = 0.0 instead of 0.5 (this was for testing purpouses).
DialogText animation speeds were not working because the method to count the total number of characters in the line was returning 0.
Cursor doesn't show the clock icon when a PopochiuDialog is active.

Added properties times_clicked and times_right_clicked to PopochiuClickable.
Added methods disable_input() and enable_input() to PopochiuClickable.
Created class for PopochiuDialogOption.