Simple Dash & Double Jump

Added:
⚙️ Gameplay Config
All gameplay numbers now live in a server-side config file (forgesimpledash-gameplay.toml) instead of being hardcoded. You can now tune:
- Stamina: base maximum, regeneration rate, regeneration delay, Stamina Boost bonus per armor piece
- Dash: cost, cooldown, impulse strength, vertical boost, air charges, on/off
- Double Jump: cost, impulse, on/off
- Sprint: stamina drain while sprinting (off by default)
- Feedback: message and sound when you run out of stamina
💨 Dash Now Keeps Your Momentum
Dash used to replace your velocity completely, so you lost sprint speed and had no control over your direction mid-dash. The impulse is now added to your current movement, so:
- sprinting into a dash keeps your sprint speed
- you can steer the dash by turning your camera while dashing
- air dashes keep your fall speed instead of resetting it
🪂 Double Jump No Longer Cancels Your Height
The double jump used to set your vertical speed to a fixed value, which made you lose height when jumping from a sprint or off a ledge. It now uses the higher of your current speed and the configured impulse.
⏳ Stamina Regeneration Delay
Stamina now takes a moment to come back after you spend it — the bar pauses for a couple of seconds, so the cost of each action actually matters. Default is 40 ticks (2 seconds). Set regenDelayTicks = 0 to restore the old behaviour.
📢 Feedback When You Run Out of Stamina
Trying to dash or double jump with insufficient stamina used to fail silently. Now you get a message above your hotbar and a sound.
🔁 Multiple Air Dashes
airCharges sets how many dashes you can perform in the air before touching the ground. Default is 1, same as before. Set it to 2 or 3 to chain dashes in the air.
🏃 Sprint Drain (optional)
A new option makes sprinting consume stamina. When your stamina hits zero you are forced to stop sprinting. Off by default.
Fixed:
- The dash and double jump sound played twice for the player who used it — now it plays once
- Removed unused internal state