lang: parser, funcs: Change the logical operators to OR, AND, NOT

This makes it easier to read for some, and easier to parse for us. This
also frees up more characters to use elsewhere.

lang/parser/lexer.nex

@@ -119,17 +119,17 @@
 			lval.str = yylex.Text()
 			return GTE
 		}
-/&&/		{
+/and/		{
 			yylex.pos(lval) // our pos
 			lval.str = yylex.Text()
 			return AND
 		}
-/\|\|/		{
+/or/		{
 			yylex.pos(lval) // our pos
 			lval.str = yylex.Text()
 			return OR
 		}
-/!/		{
+/not/		{
 			yylex.pos(lval) // our pos
 			lval.str = yylex.Text()
 			return NOT