gray and monochrome effect added.

Fri Apr 15 14:23:30 2022 +0200 : fix: fix one line and one row effect, and fix the palette sort by mode.
Thu Apr 14 15:32:26 2022 +0200 : add: add greedings for Roudoudou.
Wed Apr 13 16:12:30 2022 +0200 : add: add monochrome color convertion.
Wed Apr 13 15:26:09 2022 +0200 : add: add monochrome palette convertion.
Wed Mar 30 11:04:57 2022 +0200 : fix: fix filename amsdos convertion.
Tue Mar 29 22:23:17 2022 +0200 : fix: fix issue when saving tilemap as normal sprites.
Tue Mar 8 15:12:42 2022 +0100 : fix: fix palette widget update after swapping it.
Thu Feb 17 21:54:53 2022 +0100 : fix: fix crash when remove empty cell in animate tab.
Mon Feb 14 13:11:49 2022 +0100 : fix: fix zx0 encoding crash.
Mon Feb 14 11:54:06 2022 +0100 : fix: fix delta packing routine for screen mode.
Mon Feb 14 11:15:42 2022 +0100 : fix: fix delta animation on screen mode.
Sun Feb 13 22:23:10 2022 +0100 : add: add remove image from animate table.
Fri Feb 11 17:06:14 2022 +0100 : fix: fix one line and one row in animate tab.
Fri Feb 11 15:57:50 2022 +0100 : fix: fix animate last image offset.
Fri Feb 11 15:23:50 2022 +0100 : fix: fix glitch on animate renderer.
Wed Feb 9 14:28:05 2022 +0100 : add: add every other line and row effect on image.