Add support for some newer DuckyScript features to BadKb

[x10102]

What's new

Adds support for a couple of new commands to the BadKB scripting language.

Command	Description	Notes
CAPS [ON|OFF]	Ensures that CapsLock is on/off based on the keyboard's current LED state	Similar function to DS $_CAPSLOCK_ON
RANDOM_LETTER RANDOM_LOWERCASE_LETTER RANDOM_UPPERCASE_LETTER RANDOM_NUMBER RANDOM_SPECIAL RANDOM_CHAR	Generates a random character and sends it to the host	Equivalent function to the DS random keystroke injection features
VOLUME [0-1] BEEP [FREQ] [MS]	Plays a tone using the integrated buzzer	This one is a bit silly and doesn't have a DS equivalent, but can be used as an audio prompt before WAIT_FOR_BUTTON_PRESS or to notify that a particularly long script has finished

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For the reviewer

• I've uploaded the firmware with this patch to a device and verified its functionality
• I've confirmed the bug to be fixed / feature to be stable