[Documentation] Add documentation to header files

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Keyboard

• [x] Key (enum) #67
• [x] Combo (struct) #63
• [x] GetKeyName #54
• [x] MapToOSKey #56
• [x] MapFromOSKey #56
• [x] MapFromChar #58
• [x] KeyState (enum) #59
• [x] KeyStates (typedef) #62
• [x] KeyCallback (typedef) #65
• [x] SetCallback #65
• [x] KeyboardHookLoop #66
• [x] GetKeyState #68
• [x] GetKeyStates #68
• [x] Down #70
• [x] Up #70
• [x] Tap #71
• [x] Type #72

Mouse

• [ ] Button (enum)
• [x] GetButtonName #54
• [x] ButtonState (enum) #59
• [x] Point (struct) #64
• [x] ButtonStates (typedef) #62
• [ ] MoveCallback (typedef)
• [ ] ButtonCallback (typedef)
• [ ] ScrollCallback (typedef)
• [ ] SetMoveCallback
• [ ] SetButtonCallback
• [ ] SetScrollCallback
• [ ] MouseHookLoop
• [ ] GetPosition
• [ ] GetButtonState
• [ ] GetButtonStates
• [ ] MoveAbsolute
• [ ] MoveRelative
• [ ] Down
• [ ] Up
• [ ] Click
• [ ] Scroll

Misc

• [x] Sleep #34
• [x] PreciseSleep #34

States

• [ ] States (class)