[Keymap] Added csc027 keymaps for keebio/iris and planck (#7472)

* Added csc027 user folder and keymaps for both keebio/iris and planck

* Moved the git_macros variable out of the process_record_user function.

* Updated the usb_led code to use the new led_update_user instead of the led_set_user function.

* Update users/csc027/defines.h

Removed the "_______" macro definition in defines.h, since it has already been defined in QMK.

* Update users/csc027/defines.h

Removed the "XXXXXXX" macro definition in defines.h, since it has already been defined in QMK.

* Update users/csc027/csc027.c

Simplified several keyboard macro definitions in the csc027.c file by switching from SS_LCTRL to SS_LCTL in their definitions.

* Condensed both the planck and iris rules files to the minimal set of declarations.

users/csc027/csc027.h

@@ -0,0 +1,49 @@
+#pragma once
+
+#include "quantum.h"
+#include "defines.h"
+
+enum custom_keycodes {
+    // Layer Keycodes
+    LOWER = SAFE_RANGE,
+    RAISE,
+
+    // Git Keycodes
+    GIT_ADD, // Add
+    GIT_BRC, // Branch
+    GIT_CHK, // Checkout
+    GIT_CHR, // Cherry-Pick
+    GIT_CMT, // Commit
+    GIT_DIF, // Diff
+    GIT_FTC, // Fetch
+    GIT_GRP, // Grep
+    GIT_LOG, // Log
+    GIT_INT, // Init
+    GIT_MRG, // Merge
+    GIT_MOV, // Move (mv)
+    GIT_PSH, // Push
+    GIT_PUL, // Pull
+    GIT_RBS, // Rebase
+    GIT_RMT, // Remote
+    GIT_RST, // Reset
+    GIT_SHW, // Show
+    GIT_STH, // Stash
+    GIT_STS, // Status
+    GIT_TAG, // Tag
+
+    // Remote Desktop
+    MC_MRD7, // Minimize Remote Desktop on Windows 7
+    MC_MRD8, // Minimize Remote Desktop on Windows 8+
+    MC_ATRD  // Switch windows on local machine from Remote Desktop on Windows
+};
+
+enum custom_layers {
+    _QW = 0, // Qwerty
+    _RS,     // Raise
+    _LW,     // Lower
+    _MS,     // Mouse
+    _GT,     // Git
+    _CN,     // Convenience
+    _GW,     // Guild Wars 2
+    _CS      // Counter-Strike: Global Offensive
+};