[manuq]

Add on-screen touch controls to the HUD, shown only on touchscreens:

• A VirtualJoystick node anchored to the bottom-left corner to walk and run.
• Interact and repel buttons anchored to the bottom-right corner.
• A pause button anchored to the top-left corner, opposite to the threads in the HUD.
• Tap anywhere else to aim the grappling hook, drag to keep aiming, and lift the finger to throw.

Decisions made to simplify the controls:

• There is no separate touch button for running. Pushing the virtual joystick all the way, make the player character run.
• Repel is hidden while interact is available. This makes it not possible to repel when an interation is possible (like next to an NPC that talks). I haven't found any issues with this during a playthrough.

The controls hide during transitions, pauses and dialogue. Reset the
joystick when they hide, so the player doesn't keep walking.

I did the icons for the touch buttons myself using GIMP, they can be assumed as placeholders. I made them semitransparent, and quickly by using emojis from my system sans-serif font:

• Repel: "radio button" 🔘 U+1F518
• Pause: "double vertical bar" ⏸ U+23F8
• Interact: "left speech bubble" 🗨️ U+1F5E8

Other changes:

• Hide the input hints HUD on touchscreens.
• Remove the touchscreen warning from the title screen.
• Allow skipping the splash screen with a tap.
• Make the mouse buttons for throw and repel only respond to a real
  mouse. Godot also turns touches into mouse clicks, so touching the
  joystick was throwing the hook. Hook aiming and the mouse cursor
  ignore those emulated clicks and motion too.
• Fix the fullscreen setting being out of sync on the web. For
  example when leaving fullscreen from the browser, or now that the
  game starts in fullscreen.
• Don't warn in the console when a desktop browser can't lock the
  screen orientation.

Resolve #806

[github-actions]

Play this branch at https://play.threadbare.game/branches/endlessm/touch-support/.

(This launches the game from the start, not directly at the change(s) in this pull request.)