Add explicit eeprom include in split_common

Fixes builds that set EE_HANDS.

Remove redundant, language-specific aliases for KC_ALGR (qmk#4720)

* Use standard KC_ALGR, remove language-specific redefinitions

* Use ALGR instead of ALTGR in BÉPO and Canadian multilingual keymaps

* Remove BE_LALT, BE_LGUI aliases

Move Split Common VPATH addition (qmk#4716)

Specifically, only add the split_common folder to COMMON_VPATH if the feature is eanbled, to prevent issues with compilation

Change rgblight_get_mode & rgb_matrix_get_mode's return type to uint8…

…_t. (qmk#4747)

* Change rgblight_get_mode's return type to uint8_t.

Since rgblight_get_mode() is just returning rgblight_config_t.mode,
it should match rgblight_config_t.mode's type: uint8_t.

* Update rgb_matrix_get_mode to return uint8_t.

Register the interrupting keycode in the tap dance state struct

Fix leader processing

Fix Split Common Split_util.c typo

Keep pressed keys on layer state change (fixes qmk#2053, qmk#2279) (q…

…mk#3905)

* Keep pressed keys on layer state change

* Add doc comment for clear_keyboard_but_mods_and_keys

* Keep pressed keys only if PREVENT_STUCK_MODIFIERS is on

* Check STRICT_LAYER_RELEASE instead of PREVENT_STUCK_MODIFIERS

Read user input properly in linux_install.sh for Gentoo (qmk#4395)

* Change spaces to tabs on two lines

The rest of the file uses tabs

* Read user input in a non-terrible, non-hacky way

* Remove unnecessary tee call

* read -p is not POSIX

* Add missing $ to echo GENTOO_WARNING

* Replace non-POSIX echo -n with printf

* Use cd ... || exit 1 in case git clone fails

* Add missing sudo

Thanks @snortwolf

* Undo replacing tee with >>

Improve diagnostics for build hashes