bootloader: Add animated ticker for VOL- wait

Now an animated line is drawn while bootlogo wait is active.
This will remind user to press VOL- if needed and also give visible feedback.

A new config key was added to disable it for custom bootlogos. Set `noticker=1` in `[config]` section.
It always show for default hekate one.

For now now there's no GUI option for it.

bootloader/config.h

@@ -27,6 +27,7 @@ typedef struct _hekate_config
 	u32 autoboot;
 	u32 autoboot_list;
 	u32 bootwait;
+	u32 noticker;
 	u32 backlight;
 	u32 autohosoff;
 	u32 autonogc;