Dactyl Manuform 4x5 with 5 thumb cluster (#17671)

* Working on new dactyl

* Preliminary build and keymap in place for 4x5_5 dactyl manuform

* Removing first attempt to use 4x5

* Updating to match c style guide

* Fixing issues after merge, deletion of dactyl_manuform.h

* Spliting out custom keymap

* Adding license headers

* Fixing EE_HANDS detection on Pro-Micro

The pro-micro was not working when I plugged into the elite-c on the
right hand side of my keyboard. Adding the SPLIT_USB_DIRECT definition
fixed the issue.

* Apply suggestions from code review

Adding Drashna's delete comments

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

* Removed config.h for keymaps and tweaked keymap

Per Drashna's pr review, I have removed the config.h files for the
keymaps.
Also tweaked my keymap to switch backspace and enter. Added tapping
toggle for RAISE.

* Further tweaking ssedrick keymap for dactyl_manuform 4x5_5

As with most new keyboards, they take some getting used to.
I've rearranged my thumb cluster to hopfully a more long
term solution.

* Adding missing KC_BSLS to ssedrick keymap for 4x5_5

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

keyboards/handwired/dactyl_manuform/4x5_5/rules.mk

@@ -0,0 +1,21 @@
+
+# MCU for Elite-C/Pro Micro
+MCU = atmega32u4
+
+# BOOTLOADER for Elite-C
+# BOOTLOADER = atmel-dfu
+# BOOTLOADER for Pro Micro
+# BOOTLOADER = caterina
+
+# Build Options
+
+BOOTMAGIC_ENABLE = no       # Enable Bootmagic Lite
+MOUSEKEY_ENABLE = yes       # Mouse keys
+EXTRAKEY_ENABLE = yes       # Audio control and System control
+CONSOLE_ENABLE = no         # Console for debug
+COMMAND_ENABLE = yes        # Commands for debug and configuration
+NKRO_ENABLE = yes           # Enable N-Key Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
+AUDIO_ENABLE = no           # Audio output
+SPLIT_KEYBOARD = yes