feat: replace new keyword with this constructor syntax and ClassName.new() calls across core library and docs

Replace all uses of the `new` reserved word with explicit `this new()` constructor definitions and `ClassName.new()` instantiation calls in builtin/core.wren. Update all documentation files (classes.markdown, fiber.markdown, fn.markdown, sequence.markdown, error-handling.markdown, expressions.markdown, fibers.markdown, functions.markdown) to reflect the new constructor syntax, removing `new` keyword examples and replacing them with `ClassName.new()` patterns and `this new()` definitions.

test/language/setter/associativity.wren

@@ -1,5 +1,5 @@
 class Foo {
-  new(value) { _value = value }
+  this new(value) { _value = value }
   toString { _value }
   bar=(value) {
     _value = value
@@ -7,9 +7,9 @@ class Foo {
   }
 }
 
-var a = new Foo("a")
-var b = new Foo("b")
-var c = new Foo("c")
+var a = Foo.new("a")
+var b = Foo.new("b")
+var c = Foo.new("c")
 
 // Assignment is right-associative.
 a.bar = b.bar = c.bar = "d"

test/language/setter/grouping.wren

@@ -2,5 +2,5 @@ class Foo {
   bar=(value) { value }
 }
 
-var foo = new Foo
+var foo = Foo.new()
 (foo.bar) = "value" // expect error

test/language/setter/infix_operator.wren

@@ -2,5 +2,5 @@ class Foo {
   bar=(value) { value }
 }
 
-var foo = new Foo
+var foo = Foo.new()
 "a" + foo.bar = "value" // expect error

test/language/setter/instance.wren

@@ -4,5 +4,5 @@ class Foo {
   }
 }
 
-var foo = new Foo
+var foo = Foo.new()
 foo.bar = "value" // expect: value

test/language/setter/is.wren

@@ -2,5 +2,5 @@ class Foo {
   bar=(value) { value }
 }
 
-var foo = new Foo
+var foo = Foo.new()
 a is foo.bar = "value" // expect error

test/language/setter/prefix_operator.wren

@@ -2,5 +2,5 @@ class Foo {
   bar=(value) { value }
 }
 
-var foo = new Foo
+var foo = Foo.new()
 !foo.bar = "value" // expect error

test/language/setter/result.wren

@@ -2,5 +2,5 @@ class Foo {
   bar=(value) { "result" }
 }
 
-var foo = new Foo
+var foo = Foo.new()
 IO.print(foo.bar = "value") // expect: result

test/language/setter/same_name_as_method.wren

@@ -3,6 +3,6 @@ class Foo {
   bar { IO.print("get") }
 }
 
-var foo = new Foo
+var foo = Foo.new()
 foo.bar = "value" // expect: set
 foo.bar // expect: get