bigclock: add 12-hour & seconds support (#805)

Added P,A,M characters to bigclock and added 12hr and seconds support to bigclock via `bigclock_12hr` and `bigclock_seconds` in the config.
![image](/attachments/e95accff-4822-4801-8159-94411a6c644f)
Image has bigclock_12hr and bigclock_seconds enabled.

Farsi characters for P,A,M are blank since I don't know what it would look like in their language. (should i have just used the english characters as a placeholder?)

Reviewed-on: https://codeberg.org/fairyglade/ly/pulls/805
Reviewed-by: AnErrupTion <anerruption@disroot.org>
Co-authored-by: RadsammyT <radsammyt@gmail.com>
Co-committed-by: RadsammyT <radsammyt@gmail.com>

res/config.ini

@@ -48,7 +48,11 @@ bg = 0x00000000
 # none -> Disabled (default)
 # en   -> English
 # fa   -> Farsi
-bigclock = none
+bigclock = en
+# Set bigclock to 12-hour notation.
+bigclock_12hr = false 
+# Set bigclock to show the seconds.
+bigclock_seconds = false
 
 # Blank main box background
 # Setting to false will make it transparent