Alphas Elemental Arrows

• Made cobwebs flammable
• campfires will ignite regular arrows and turn them into fire arrows
• fire will ignite regular arrows and turn them into fire arrows
• made blue ice formable as a constant waterblock, only near a target armorstand.
• blue ice can also be melted only in the range of a target armorstand

Added a target/conditional system to counter griefing in multiplayer settings:

• It works with the also added Gamemode System - depending on the mode,  elemental arrow features will be enabled and disabled. Basically armorstands that are tagged with either:
• "arrow_target_fire", "arrow_target_ice" & "arrow_target_light" will enable the effect of the arrow to work in their vicinity. Multiple are possible.
• Blue ice can only be formed if near a "arrow_target_ice" and gamemode 1 or above
• Cobwebs can only be lit if near a "arrow_target_fire" in gamemode 1 or without target in gamemode 2
• White Glazed Terracotta can only ever be dissolved near a target in gamemode 1 or above.

Added special Gamemodes to the Datapack also to counter griefing as well.

• Gamemode 0: no features enabled
• Gamemode 1:usual playability, temporary ice can be formed everywhere, cobwebs and white terracotta can be removed near targets and blue ice can alos be formed/melted if near a target.
• Gamemode 2: cobwebs can be lit without limits.