Implement skippable, chained voice recordings

[miskatonicstudio]

General idea:

• the character starts saying something
• the interaction is disabled for the moment (player cannot move, rotate camera, pick up objects etc)
• the cursor in 3D mode is hidden (probably)
• when an action key is pressed (Esc, LMB, RMB, etc.) the monologue ends and the control returns to player, unless
• if there is another monologue scheduled to be played after this one, it is played with the interaction still disabled, until all monologues are played

EDIT: while working on this,consider that:

• when the voice is played the current game mode should be shown as usual (e.g. the inventory with a blurred background), with some minor exceptions
• the exceptions include: Player's scope should be hidden to indicate that interaction is not active, same for Inventory's cursor
• screenshot taking should work normally regardless of the mode (taking screenshots with subtitles shown has to work)

[miskatonicstudio]

This requires capturing the input in goat_voice, so a sample can be skipped. It can be achieved by introducing a new game mode, however, by far all game modes are "exclusive". This one would have to be a mode on top of another mode, to that it works both in EXPLORATION mode and in INVENTORY mode.

Possible solutions:

• delay handling the input until another scene with a higher priority can handle it (if no such scene exist, handle it in the current scene in _process)
• introduce secondary game mode/game submode, which will be considered when checking if the current main game mode is exclusive
• introduce input game mode, which will be used only for input (by default it will be the main mode, but can be temporarily replaced by something else)

[miskatonicstudio]

Voice now captures input and can be skipped, but sequences are not yet implemented.