[Keymap] Added userspace for d4mation. Included their keymap for the Atreus62 (#7483)

* Added userspace for d4mation. Included their keymap for the Atreus62

* Do not assign layer numbers manually

* Remove some unneeded things per @drashna's recommendation

* Fix some single line comments I missed

* Update unicode macros to use send_unicode_hex_string() instead of process_unicode()

* OBetter check for Unicode Enabled. Moved some checks into macros.c

* Use eeconfig_init_user() to set default unicode input mode

users/d4mation/macros.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include "quantum.h"
+#include "tap-hold.h"
+#include "zalgo.h"
+
+#define SCRGB LCTL( LSFT( LGUI( KC_4 ) ) ) /* Mac Screen Area Grab shortcut (Puts into Clipboard) */
+#define SLEEP LALT( LGUI( KC_SYSTEM_POWER ) ) /* Instant sleep on Mac, rather than having to hold down the button */
+
+enum custom_keycodes {
+  _GRAVE_ESC = SAFE_RANGE, /* Prefixed with underscore to prevent conflicts */
+  PHPOPEN, /* <?php */
+  PHPCLSE, /* ?> */
+  AMENO, 
+  MAGIC,
+  LENNY,
+  DISFACE,
+  TFLIP,
+  TPUT,
+  SHRUG,
+  ZALGO,
+  NEW_SAFE_RANGE
+};