Rework stdout buffering on Windows.

Windows doesn't support line-buffering. We enable full-buffering instead and flush buffers per module.

src/data/config_user.txt

@@ -40,12 +40,6 @@
 # Default is false.
 #--stat true
 
-# Disable stdout buffer option:
-# Sets if fastfetch should disable application buffer of stdout. Mainly for debugging purpose.
-# Must be true or false.
-# Default is false.
-#--unbuffered false
-
 # Slow operations option:
 # Sets if fastfetch is allowed to use known slow operations to detect more / better values.
 # Must be true or false.

src/data/help.txt

@@ -20,7 +20,6 @@ General options:
     --multithreading <?value>:        use multiple threads to detect values
     --stat <?value>:                  print time usage (in ms) for individual modules
     --allow-slow-operations <?value>: allow operations that are usually very slow for more detailed output
-    --unbuffered <?value>: disable stdout application buffer
     --escape-bedrock <?value>:        on bedrock linux, sets if it should escape the bedrock jail or not
     --pipe <?value>:                  disable logo and all escape sequences