add keyboard: bemeier/bmek (revisited) (#10144)

* bmek keyboard support

* Update keyboards/bemeier/bmek/bmek.h

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Update keyboards/bemeier/bmek/rules.mk

Co-authored-by: Drashna Jaelre <drashna@live.com>

* moved shutdown behavior to shutdown hook

* removed dynamic macro option statement

* Apply suggestions from code review

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

* change layout name in via

* move/copy root rules to revs

* Apply suggestions from code review

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Apply suggestions from code review

Co-authored-by: Drashna Jaelre <drashna@live.com>

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

keyboards/bemeier/bmek/rev3/rules.mk

@@ -0,0 +1,21 @@
+# MCU name
+MCU = atmega32u4
+
+# Bootloader selection
+BOOTLOADER = atmel-dfu
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE      = lite
+MOUSEKEY_ENABLE       = no
+EXTRAKEY_ENABLE       = yes
+CONSOLE_ENABLE        = no
+COMMAND_ENABLE        = no
+SLEEP_LED_ENABLE      = yes
+SPLIT_KEYBOARD        = no
+BACKLIGHT_ENABLE      = no
+NKRO_ENABLE           = yes
+RGBLIGHT_ENABLE       = yes
+AUDIO_ENABLE          = no
+LTO_ENABLE            = yes