feat(wm): add new cmd to set active border offset

This commit introduces a new command, active-window-border-offset, which
allows the user to offset the starting position of the active window
border, thereby allowing for thicker or thinner active window borders,
when used in conjunction with the active-window-border-width command.

resolve #232

komorebic.lib.ahk

@@ -344,6 +344,10 @@ ActiveWindowBorderWidth(width) {
     RunWait, komorebic.exe active-window-border-width %width%, , Hide
 }
 
+ActiveWindowBorderOffset(offset) {
+    RunWait, komorebic.exe active-window-border-offset %offset%, , Hide
+}
+
 FocusFollowsMouse(boolean_state, implementation) {
     RunWait, komorebic.exe focus-follows-mouse %boolean_state% --implementation %implementation%, , Hide
 }