break up keymaps and quantum keycodes into files by feature

docs/keycodes_us_ansi_shifted.md

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+# US ANSI Shifted symbols
+
+These keycodes correspond to characters that are "shifted" on a standard US ANSI keyboards. They do not have dedicated keycodes but are instead typed by holding down shift and then sending a keycode. 
+
+It's important to remember that all of these keycodes send a left shift - this may cause unintended actions if unaccounted for. The short code is preferred in most situations.
+
+## US ANSI Shifted Keycodes
+
+|Short Name|Long Name|Description|
+|----------|---------|-----------|
+|`KC_TILD`|`KC_TILDE`|tilde `~`|
+|`KC_EXLM`|`KC_EXCLAIM`|exclamation mark `!`|
+|`KC_AT`||at sign `@`|
+|`KC_HASH`||hash sign `#`|
+|`KC_DLR`|`KC_DOLLAR`|dollar sign `$`|
+|`KC_PERC`|`KC_PERCENT`|percent sign `%`|
+|`KC_CIRC`|`KC_CIRCUMFLEX`|circumflex `^`|
+|`KC_AMPR`|`KC_AMPERSAND`|ampersand `&`|
+|`KC_ASTR`|`KC_ASTERISK`|asterisk `*`|
+|`KC_LPRN`|`KC_LEFT_PAREN`|left parenthesis `(`|
+|`KC_RPRN`|`KC_RIGHT_PAREN`|right parenthesis `)`|
+|`KC_UNDS`|`KC_UNDERSCORE`|underscore `_`|
+|`KC_PLUS`||plus sign `+`|
+|`KC_LCBR`|`KC_LEFT_CURLY_BRACE`|left curly brace `{`|
+|`KC_RCBR`|`KC_RIGHT_CURLY_BRACE`|right curly brace `}`|
+|`KC_LT`/`KC_LABK`|`KC_LEFT_ANGLE_BRACKET`|left angle bracket `<`|
+|`KC_GT`/`KC_RABK`|`KC_RIGHT_ANGLE_BRACKET`|right angle bracket `>`|
+|`KC_COLN`|`KC_COLON`|colon `:`|
+|`KC_PIPE`||pipe `\|`|
+|`KC_QUES`|`KC_QUESTION`|question mark `?`|
+|`KC_DQT`/`KC_DQUO`|`KC_DOUBLE_QUOTE`|double quote `"`|