dir: order of directories and hidden directories is incorrect with -a flag

By default, from GNU's help page on the dir command, it seems like GNU's dir command sorts by WORD. One thing that I noticed is when I used dir command on my home directory is the following:

asder8215@new-host-4:~$ dir -a
.	       .bashrc	       .debug	   .gtkrc-2.0  Pictures  .ssh
..	       .cache	       Desktop	   .local      .pki	 Templates
.bash_history  .cargo	       Documents   .mozilla    .profile  .var
.bash_logout   coding-project  Downloads   Music       Public	 Videos
.bash_profile  .config	       .gitconfig  .npm        .rustup	 .vscode-oss

GNU's dir command, by default, outputs the order of the directories in alphabetical order ignoring the leading dots for hidden directories. This logic follows through with all other sort options, like sizes, as shown in the following example:

asder8215@new-host-4:~$ dir -a --size
total 64
 0 .		   0 .cache	      0 Documents    0 Music	  0 .rustup
 0 ..		   4 .cargo	      0 Downloads    0 .npm	  0 .ssh
36 .bash_history   0 coding-project   4 .gitconfig   0 Pictures   0 Templates
 4 .bash_logout    0 .config	      4 .gtkrc-2.0   0 .pki	  0 .var
 4 .bash_profile   0 .debug	      0 .local	     4 .profile   0 Videos
 4 .bashrc	   0 Desktop	      0 .mozilla     0 Public	  0 .vscode-oss

Unfortunately, this does not appear to be the case in uutils dir because when I run the same command, I get the following result:

asder8215@new-host-4:~$ ~/coding-project/coreutils/target/release/dir -a
.	       .bashrc	.gitconfig  .pki      .vscode-oss  Pictures
..	       .cache	.gtkrc-2.0  .profile  Desktop	   Public
.bash_history  .cargo	.local	    .rustup   Documents	   Templates
.bash_logout   .config	.mozilla    .ssh      Downloads	   Videos
.bash_profile  .debug	.npm	    .var      Music	   coding-project

Moreover, taking away the -a flag and comparing the results of what GNU's dir command and uutils dir command on the home directory, we can see the following difference:

asder8215@new-host-4:~$ dir
coding-project	Desktop  Documents  Downloads  Music  Pictures	Public	Templates  Videos

asder8215@new-host-4:~$ ~/coding-project/coreutils/target/release/dir
Desktop	   Downloads  Pictures	Templates  coding-project
Documents  Music      Public	Videos

GNU's dir command is ascii insensitive in the sense that it treats 'c' and 'C' as preceding that of 'd' or 'D'. uutils' dir command seems to be ascii sensitive, which lines up with how it currently orders the directories (and why all the hidden directories are printed earlier than regular directories due to '.' having an ascii value of 46 which precedes the alphabetical characters' ascii values). We should make uutils' dir command ascii insensitive and remove consideration of leading dots when outputting the order of directories with -a flag.

Start with the uutils dir command and compare its default and -a output with GNU dir, including mixed-case names and hidden entries. Done means directory names sort case-insensitively and leading dots are ignored for ordering under -a, while the shown default and size-sorting behavior matches GNU.