Draft: Text prompt features

WIP!

New:

• Added USDF-SRB2 DIALOGUE parser
• Added multiplayer support
• Implemented text sound support
  • textsound in USDF-SRB2
  • TEXTSFX in SOC
• Added choices support
• Added to Lua:
  • P_StartTextPrompt
  • P_EndTextPrompt
  • player.promptactive

Text commands

A text command starts with a { and ends with a }. After the {, there must be the command name. Optionally, after the command name, there may be a parameter. Whitespace after the { and before the } is ignored.

Text commands are parsed in page dialog text. They may be escaped by typing a backslash (\) before the { character. (Example: \{Escaped})

List of commands:

Name	Description	Parameter
DELAY	Adds a pause.	Optional; default is 12
PAUSE	Similar to DELAY, but the player's inputs are ignored during the pause.	Optional; default is 12
SPEED	Changes the text speed. A speed of 0 causes the text to be typed instantly.	Text speed in frames; must be an integer
NAME	Changes the narrator name.	Narrator name; must be a string
ICON	Changes the narrator icon.	Icon name; must be a string
CHARNAME	Is replaced by the player skin name.	None
SUPERNAME	Is replaced by the player skin super name.	None
PLAYERNAME	Is replaced by the player netgame name. In singleplayer, this acts the same as CHARNAME	None
NEXTPAGE	Immediately causes the text prompt to go to the next page.	None
WAIT	Pauses the writing of the text, and waits for the player's input to resume typing.	None
COLOR	Changes the text color.	Optional. Accepted parameters: WHITE, MAGENTA, YELLOW, GREEN, BLUE, RED, GRAY, ORANGE, SKY, PURPLE, AQUA, PERIDOT, AZURE, BROWN, ROSY, INVERT. Default is WHITE

COLOR commands are parsed and supported in page names and choice text.

Choices

A page may have multiple choices that the player may select. A choice may have a conversation or page to go to whenever it is selected. It may also execute a linedef, or end the conversation. Choices may specify if they are the highlighted choice whenever the list is presented to the user, or the choice to be highlighted whenever the player presses Spin.