v0.7b

Zrc v0.7b has now been released:

• expr shunting yard speed up, almost 200% faster
• %include is now include
• The commands ! and @ can now also be called by their alt names, not and fork
• ARG_MAX CLI arguments now supported
• General QoL improvements
• Slight code refactoring, including performance boosts
• Early draft of a new library (ipc)
• Despite all this, somehow the binary is somehow smaller now