Changed a few things

* Integrated # and ~ decorators into the expression system. Created associated operators.
* # and ~ decorators only affect their current line. That's more useful...
* Fix our priority system to evaluate left-to-right instead of right-to-left (if there was a reason why I did it this way initially, I don't remember it so ¯\_(ツ)_/¯)
* a lotta internal changes

Various other small adjustments, see the diff of REFERENCE.md for details.

test/tests/condition operator.lua

@@ -0,0 +1,35 @@
+local _={}
+_[13]={}
+_[12]={}
+_[11]={}
+_[10]={tags=_[13],text="c"}
+_[9]={tags=_[13],text="a "}
+_[8]={tags=_[11],text=" c"}
+_[7]={tags=_[12],text="b"}
+_[6]={tags=_[11],text="a "}
+_[5]={_[9],_[10]}
+_[4]={_[6],_[7],_[8]}
+_[3]={"return"}
+_[2]={"text",_[5]}
+_[1]={"text",_[4]}
+return {_[1],_[2],_[3]}
+--[[
+{ "text", { {
+      tags = <1>{},
+      text = "a "
+    }, {
+      tags = {},
+      text = "b"
+    }, {
+      tags = <table 1>,
+      text = " c"
+    } } }
+{ "text", { {
+      tags = <1>{},
+      text = "a "
+    }, {
+      tags = <table 1>,
+      text = "c"
+    } } }
+{ "return" }
+]]--