Hang Glider Mod for Minetest

This is a fork of the minetest-hangglider mod by Piezo_ (orderofthefourthwall@gmail.com)

Which is located at: https://notabug.org/Piezo_/minetest-hangglider

This was last synched up with Piezo_'s updates from Nov 25.

• hud overlay and debug can be enabled/disabled.
• Added blender-rendered overlay for struts using the actual model.
• Reduced airbreak penalty severity
• gave glider limited durability.

I've made the following changes to the code:

• Slightly blurred Piezo_'s excellent strut overlay.
• Changed flight speed to increase smoothly. It starts at 1 and maxes out at 1.75.
• Use minetest.get_version() to automatically choose which set_attach offset to use depending on whether minetest version is 0.4.x or 5.x.
• Removed use of blank.png overlay.
• Detect when hangglider is no longer wielded_item and unequip if appropriate. Don't hit 'Q' key during flight.
• Added AUX key as hangglider equip alternative, in addition to left-click. This allows hangglider flight on Android clients.
• Wear is back and better than ever. Breaks on unequip rather than equip, so doesn't leave you falling from a cliff.
• Number of uses is configurable, currently defaults to 50, but expect this will need tuning.
• Updated pos offset for launching, so don't have unintended wear when standing.
• Added sound while flying.