Add Enter button to spec and keyboard_input

It was mistakenly left out.

docs/specs/Keyboard_Manager-Parser_Spec.txt

@@ -68,6 +68,7 @@ A token is either a modifier symbol, literal symbol, symbol sequence or space ch
 | Keypad Asterisk | `KPSTAR` |
 | Keypad Minus | `KPMINUS` |
 | Keypad Plus | `KPPLUS` |
+| Enter | `ENTER` |
 
 
 ### Misc symbols

src/keyboard_input/input_parser.cpp

@@ -142,6 +142,10 @@ std::optional<Token> checkIfLegalCapitalLiteral( std::string input ) noexcept
     {
         return Token::KEY_KPPLUS;
     }
+    if ( input == "ENTER" )
+    {
+        return Token::KEY_ENTER;
+    }
 
     // LOG incorrect character
     return std::nullopt;
@@ -382,6 +386,8 @@ bool isLiteral( const Token token ) noexcept
         return true;
     case Token::KEY_KPPLUS:
         return true;
+    case Token::KEY_ENTER:
+        return true;
 
     default:
         return false;

src/keyboard_input/input_parser.h

@@ -76,6 +76,7 @@ enum class Token
     KEY_KPSTAR,
     KEY_KPMINUS,
     KEY_KPPLUS,
+    KEY_ENTER,
 
     // Misc tokens
     TOKEN_NEW_SEQUENCE,

src/keyboard_input/input_sender_X11.cpp

@@ -73,6 +73,8 @@ unsigned int tokenToKeyCode( const Token token, Display* const display )
         return XK_KP_Subtract;
     case Token::KEY_KPPLUS:
         return XK_KP_Add;
+    case Token::KEY_ENTER:
+        return XK_Return;
 
     case Token::MODIFIER_CTRL:
         return XK_Control_L;

src/keyboard_input/input_sender_win.cpp

@@ -73,6 +73,8 @@ WORD convertToVirtualKeycode( const Token token )
         return VK_SUBTRACT;
     case Token::KEY_KPPLUS:
         return VK_ADD;
+    case Token::KEY_ENTER:
+        return VK_RETURN;
 
     case Token::MODIFIER_CTRL:
         return VK_CONTROL;