feat: multi-version compatible adapter 1.26.3-1.26.13 and stability fix

[wlkek]

• Extended version mapping support 1.26.3 to 1.26.13
• Client version updated to v2.6.3
• Use Python embed_resource.py instead of ld.exe to embed resources
• Added a null pointer protection to prevent crashes:
• Hook::hook() adds a target==0 check
• Keyboard::isKeyDown() adds a check for keyMap null
• All functions of the tessellator added empty check for signature
• MinecraftPackets::createPacket() adds an empty check
• ItemStackBase::getHoverName() fixed and added null check
• Item::getDamageValue() Add an empty check
• Actor adds empty checks for all component functions
• Player::getMoveInputComponent() adds an empty check
• ClientInstance::grabCursor/releaseCursor/get() adds an empty check
• GameCore::get() adds a null check
• GeneralHooks adds a null check for MouseInputVector
• Accelerated by downloading using a mirror
• mnemosyne disabled test build

[Plextora]

Don't add 10+ random changes to a PR, if you must do all of these at least split them up.

There's a lot of questionable changes here (using a random mirror just for cpm seems odd, why would we use a python script for embedding resources over ld, which is widely used and understood, etc.), was this vibecoded?