Added duckyScript 3.0 functionality

[TzurSoffer]

The HOLD and RELEASE commands add the ability to hold and release a key, when the HOLD command is called, the key will be pressed, and it will only release once the RELEASE command has been called. This enables more complex operations with the payload.
Example usage of this will look like this:

HOLD SHIFT
HOLD s
DELAY 4000
RELEASE SHIFT
DELAY 4000
RELEASE s

[dbisu]

I'm working to review PRs this week.

[TzurSoffer]

I have expanded the scope of this pull request to include most of ducky script 3.0

[TzurSoffer]

Since this is a big update, here is a list of the changes I made
ADDED missing keys
ADDED consumer keys (Volume)
ADDED defines
ADDED HOLD and RELEASE
ADDED REM_BLOCK
ADDED STRINGLN
ADDED STRINGLN block
ADDED STRING block
ADDED RANDOM_LOWERCASE_LETTER
ADDED RANDOM_UPPERCASE_LETTER
ADDED RANDOM_LETTER
ADDED RANDOM_NUMBER
ADDED RANDOM_SPECIAL
ADDED RANDOM_CHAR
ADDED VID_RANDOM
ADDED PID_RANDOM
ADDED MAN_RANDOM
ADDED PROD_RANDOM
ADDED SERIAL_RANDOM
ADDED RESET
ADDED RESTART_PAYLOAD
ADDED STOP_PAYLOAD