Clarify the quantum license (#1042)

* Clarify the license for files we have signoff on

* Update against the currently signed off files

* Remove unused and not clearly licensed headers

* Replace an #endif I accidentally removed while resolving merge conflicts

quantum/keymap_extras/keymap_russian.h

@@ -1,77 +0,0 @@
-#ifndef KEYMAP_RUSSIAN_H
-#define KEYMAP_RUSSIAN_H
-
-#include "keymap.h"
-
-// Normal Chracters      // reg   SHIFT
-#define RU_A     KC_F    // а and А
-#define RU_BE    KC_COMM // б and Б
-#define RU_VE    KC_D    // в and В
-#define RU_GHE   KC_U    // г and Г
-#define RU_DE    KC_L    // д and Д
-#define RU_IE    KC_T    // е and Е
-#define RU_IO    KC_GRV  // ё and Ё
-#define RU_ZHE   KC_SCLN // ж and Ж
-#define RU_ZE    KC_P    // з and З
-#define RU_I     KC_B    // и and И
-#define RU_SRT_I KC_Q    // й and Й
-#define RU_KA    KC_R    // к and К
-#define RU_EL    KC_K    // л and Л
-#define RU_EM    KC_V    // м and М
-#define RU_EN    KC_Y    // н and Н
-#define RU_O     KC_J    // о and О
-#define RU_PE    KC_G    // п and П
-#define RU_ER    KC_H    // р and Р
-#define RU_ES    KC_C    // с and С
-#define RU_TE    KC_N    // т and Т
-#define RU_U     KC_E    // у and У
-#define RU_EF    KC_A    // ф and Ф
-#define RU_HA    KC_LBRC // х and Х
-#define RU_TSE   KC_W    // ц and Ц
-#define RU_CHE   KC_X    // ч and Ч
-#define RU_SHA   KC_I    // ш and Ш
-#define RU_SHCHA KC_O    // щ and Щ
-#define RU_HSIGN KC_RBRC // ъ and Ъ
-#define RU_YERU  KC_S    // ы and Ы
-#define RU_SSIGN KC_M    // ь and Ь
-#define RU_E     KC_QUOT // э and Э
-#define RU_YU    KC_DOT  // ю and Ю
-#define RU_YA    KC_Z    // я and Я
-
-#define RU_1     KC_1    // 1 and !
-#define RU_2     KC_2    // 2 and "
-#define RU_3     KC_3    // 3 and №
-#define RU_4     KC_4    // 4 and ;
-#define RU_5     KC_5    // 5 and %
-#define RU_6     KC_6    // 6 and :
-#define RU_7     KC_7    // 7 and ?
-#define RU_8     KC_8    // 8 and *
-#define RU_9     KC_9    // 9 and (
-#define RU_0     KC_0    // 0 and )
-
-#define RU_MINS  KC_MINS // - and _
-#define RU_EQL   KC_EQL  // = and +
-#define RU_BSLS  KC_BSLS // \ and /
-#define RU_DOT   KC_SLSH // . and ,
-
-// Shifted Chracters
-#define RU_EXLM LSFT(RU_1) // !
-#define RU_DQUT LSFT(RU_2) // "
-#define RU_NMRO LSFT(RU_3) // №
-#define RU_SCLN LSFT(RU_4) // ;
-#define RU_PERC LSFT(RU_5) // %
-#define RU_COLN LSFT(RU_6) // :
-#define RU_QUES LSFT(RU_7) // ?
-#define RU_ASTR LSFT(RU_8) // *
-#define RU_LPRN LSFT(RU_9) // (
-#define RU_RPRN LSFT(RU_0) // )
-
-#define RU_UNDR LSFT(RU_MINS) // _
-#define RU_PLUS LSFT(RU_EQL)  // +
-#define RU_SLSH LSFT(RU_BSLS) // /
-#define RU_COMM LSFT(RU_DOT)  // ,
-
-// Alt Gr-ed characters
-#define RU_RUBL RALT(RU_8) // ₽
-
-#endif